diff --git a/.gitignore b/.gitignore
index 4afa5e4..037f2cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,6 @@ node_modules/
 dist/
 yarn-*
 package-lock.json
-*.log
\ No newline at end of file
+*.log
+vscode-profile-*
+flamegraph.htm
\ No newline at end of file
diff --git a/flamegraph.htm b/flamegraph.htm
deleted file mode 100644
index ad2f655..0000000
--- a/flamegraph.htm
+++ /dev/null
@@ -1,11392 +0,0 @@
-<!DOCTYPE html>
-<html>
-  <head>
-    <!--
-        NOTE: This HTML file was generated automatically by "stackvis share".
-        Do not edit this file directly.
-     -->
-    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
-    <title>Flame graph</title>
-    <style type="text/css">
-        /*
- * icicle.css: styles for Icicle visualization
- */
-body {
-	font-family: sans-serif;
-	font-size: small;
-	padding-left: 20px;
-	padding-right: 20px;
-	color: #333333;
-}
-
-a {
-	color: #CC2900;
-}
-
-div#chart {
-	width: 100%;
-	margin-top: 20px;
-}
-
-rect.svBox {
-	stroke: #fff;
-}
-
-rect.svBox:hover {
-	cursor: pointer;
-}
-
-.svBoxLabel {
-	cursor: pointer;
-	fill: #333333;
-}
-
-div.svTooltip {
-	opacity: 0;
-	z-index: 2;
-	position: absolute;           
-	height: 3em;                 
-	white-space: nowrap;
-	padding-top: 8px;             
-	padding-left: 12px;
-	padding-right: 12px;
-	padding-bottom: 18px;
-	font-size: small;
-	background: #ffffee;   
-	border: 0px;
-	border-radius: 2px;           
-	pointer-events: none;  
-}
-
-div.svPopout {
-	position: absolute;
-	border-radius: 2px;
-	border: 2px #333333 solid;
-	padding: 6px;
-	background-color: #ffffff;
-	opacity: 0;
-	z-index: -1;
-	width: 50%;
-}
-
-.svXAxisLabel {
-	font-size: large;
-	font-weight: bold;
-	font-variant: small-caps;
-	text-align: center;
-	width: 100%;
-	letter-spacing: 0.3em;
-	margin-bottom: 20px;
-}
-
-.svYAxisLabel {
-	font-size: large;
-	font-weight: bold;
-	font-variant: small-caps;
-	text-align: center;
-	letter-spacing: 0.3em;
-	white-space: nowrap;
-}
-
-    </style>
-    <script type="text/javascript">
-        /* BEGIN contents of d3.v2.js */
-        (function(){if (!Date.now) Date.now = function() {
-  return +new Date;
-};
-try {
-  document.createElement("div").style.setProperty("opacity", 0, "");
-} catch (error) {
-  var d3_style_prototype = CSSStyleDeclaration.prototype,
-      d3_style_setProperty = d3_style_prototype.setProperty;
-  d3_style_prototype.setProperty = function(name, value, priority) {
-    d3_style_setProperty.call(this, name, value + "", priority);
-  };
-}
-d3 = {version: "2.8.1"}; // semver
-function d3_class(ctor, properties) {
-  try {
-    for (var key in properties) {
-      Object.defineProperty(ctor.prototype, key, {
-        value: properties[key],
-        enumerable: false
-      });
-    }
-  } catch (e) {
-    ctor.prototype = properties;
-  }
-}
-var d3_array = d3_arraySlice; // conversion for NodeLists
-
-function d3_arrayCopy(pseudoarray) {
-  var i = -1, n = pseudoarray.length, array = [];
-  while (++i < n) array.push(pseudoarray[i]);
-  return array;
-}
-
-function d3_arraySlice(pseudoarray) {
-  return Array.prototype.slice.call(pseudoarray);
-}
-
-try {
-  d3_array(document.documentElement.childNodes)[0].nodeType;
-} catch(e) {
-  d3_array = d3_arrayCopy;
-}
-
-var d3_arraySubclass = [].__proto__?
-
-// Until ECMAScript supports array subclassing, prototype injection works well.
-function(array, prototype) {
-  array.__proto__ = prototype;
-}:
-
-// And if your browser doesn't support __proto__, we'll use direct extension.
-function(array, prototype) {
-  for (var property in prototype) array[property] = prototype[property];
-};
-d3.map = function(object) {
-  var map = new d3_Map;
-  for (var key in object) map.set(key, object[key]);
-  return map;
-};
-
-function d3_Map() {}
-
-d3_class(d3_Map, {
-  has: function(key) {
-    return d3_map_prefix + key in this;
-  },
-  get: function(key) {
-    return this[d3_map_prefix + key];
-  },
-  set: function(key, value) {
-    return this[d3_map_prefix + key] = value;
-  },
-  remove: function(key) {
-    key = d3_map_prefix + key;
-    return key in this && delete this[key];
-  },
-  keys: function() {
-    var keys = [];
-    this.forEach(function(key) { keys.push(key); });
-    return keys;
-  },
-  values: function() {
-    var values = [];
-    this.forEach(function(key, value) { values.push(value); });
-    return values;
-  },
-  entries: function() {
-    var entries = [];
-    this.forEach(function(key, value) { entries.push({key: key, value: value}); });
-    return entries;
-  },
-  forEach: function(f) {
-    for (var key in this) {
-      if (key.charCodeAt(0) === d3_map_prefixCode) {
-        f.call(this, key.substring(1), this[key]);
-      }
-    }
-  }
-});
-
-var d3_map_prefix = "\0", // prevent collision with built-ins
-    d3_map_prefixCode = d3_map_prefix.charCodeAt(0);
-function d3_this() {
-  return this;
-}
-d3.functor = function(v) {
-  return typeof v === "function" ? v : function() { return v; };
-};
-// Copies a variable number of methods from source to target.
-d3.rebind = function(target, source) {
-  var i = 1, n = arguments.length, method;
-  while (++i < n) target[method = arguments[i]] = d3_rebind(target, source, source[method]);
-  return target;
-};
-
-// Method is assumed to be a standard D3 getter-setter:
-// If passed with no arguments, gets the value.
-// If passed with arguments, sets the value and returns the target.
-function d3_rebind(target, source, method) {
-  return function() {
-    var value = method.apply(source, arguments);
-    return arguments.length ? target : value;
-  };
-}
-d3.ascending = function(a, b) {
-  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
-};
-d3.descending = function(a, b) {
-  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
-};
-d3.mean = function(array, f) {
-  var n = array.length,
-      a,
-      m = 0,
-      i = -1,
-      j = 0;
-  if (arguments.length === 1) {
-    while (++i < n) if (d3_number(a = array[i])) m += (a - m) / ++j;
-  } else {
-    while (++i < n) if (d3_number(a = f.call(array, array[i], i))) m += (a - m) / ++j;
-  }
-  return j ? m : undefined;
-};
-d3.median = function(array, f) {
-  if (arguments.length > 1) array = array.map(f);
-  array = array.filter(d3_number);
-  return array.length ? d3.quantile(array.sort(d3.ascending), .5) : undefined;
-};
-d3.min = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
-  } else {
-    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
-  }
-  return a;
-};
-d3.max = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = array[i]) != null && b > a) a = b;
-  } else {
-    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null && b > a) a = b;
-  }
-  return a;
-};
-d3.extent = function(array, f) {
-  var i = -1,
-      n = array.length,
-      a,
-      b,
-      c;
-  if (arguments.length === 1) {
-    while (++i < n && ((a = c = array[i]) == null || a != a)) a = c = undefined;
-    while (++i < n) if ((b = array[i]) != null) {
-      if (a > b) a = b;
-      if (c < b) c = b;
-    }
-  } else {
-    while (++i < n && ((a = c = f.call(array, array[i], i)) == null || a != a)) a = undefined;
-    while (++i < n) if ((b = f.call(array, array[i], i)) != null) {
-      if (a > b) a = b;
-      if (c < b) c = b;
-    }
-  }
-  return [a, c];
-};
-d3.random = {
-  normal: function(mean, deviation) {
-    if (arguments.length < 2) deviation = 1;
-    if (arguments.length < 1) mean = 0;
-    return function() {
-      var x, y, r;
-      do {
-        x = Math.random() * 2 - 1;
-        y = Math.random() * 2 - 1;
-        r = x * x + y * y;
-      } while (!r || r > 1);
-      return mean + deviation * x * Math.sqrt(-2 * Math.log(r) / r);
-    };
-  }
-};
-function d3_number(x) {
-  return x != null && !isNaN(x);
-}
-d3.sum = function(array, f) {
-  var s = 0,
-      n = array.length,
-      a,
-      i = -1;
-
-  if (arguments.length === 1) {
-    while (++i < n) if (!isNaN(a = +array[i])) s += a;
-  } else {
-    while (++i < n) if (!isNaN(a = +f.call(array, array[i], i))) s += a;
-  }
-
-  return s;
-};
-// R-7 per <http://en.wikipedia.org/wiki/Quantile>
-d3.quantile = function(values, p) {
-  var H = (values.length - 1) * p + 1,
-      h = Math.floor(H),
-      v = values[h - 1],
-      e = H - h;
-  return e ? v + e * (values[h] - v) : v;
-};
-d3.transpose = function(matrix) {
-  return d3.zip.apply(d3, matrix);
-};
-d3.zip = function() {
-  if (!(n = arguments.length)) return [];
-  for (var i = -1, m = d3.min(arguments, d3_zipLength), zips = new Array(m); ++i < m;) {
-    for (var j = -1, n, zip = zips[i] = new Array(n); ++j < n;) {
-      zip[j] = arguments[j][i];
-    }
-  }
-  return zips;
-};
-
-function d3_zipLength(d) {
-  return d.length;
-}
-d3.bisector = function(f) {
-  return {
-    left: function(a, x, lo, hi) {
-      if (arguments.length < 3) lo = 0;
-      if (arguments.length < 4) hi = a.length;
-      while (lo < hi) {
-        var mid = lo + hi >> 1;
-        if (f.call(a, a[mid], mid) < x) lo = mid + 1;
-        else hi = mid;
-      }
-      return lo;
-    },
-    right: function(a, x, lo, hi) {
-      if (arguments.length < 3) lo = 0;
-      if (arguments.length < 4) hi = a.length;
-      while (lo < hi) {
-        var mid = lo + hi >> 1;
-        if (x < f.call(a, a[mid], mid)) hi = mid;
-        else lo = mid + 1;
-      }
-      return lo;
-    }
-  };
-};
-
-var d3_bisector = d3.bisector(function(d) { return d; });
-d3.bisectLeft = d3_bisector.left;
-d3.bisect = d3.bisectRight = d3_bisector.right;
-d3.first = function(array, f) {
-  var i = 0,
-      n = array.length,
-      a = array[0],
-      b;
-  if (arguments.length === 1) f = d3.ascending;
-  while (++i < n) {
-    if (f.call(array, a, b = array[i]) > 0) {
-      a = b;
-    }
-  }
-  return a;
-};
-d3.last = function(array, f) {
-  var i = 0,
-      n = array.length,
-      a = array[0],
-      b;
-  if (arguments.length === 1) f = d3.ascending;
-  while (++i < n) {
-    if (f.call(array, a, b = array[i]) <= 0) {
-      a = b;
-    }
-  }
-  return a;
-};
-d3.nest = function() {
-  var nest = {},
-      keys = [],
-      sortKeys = [],
-      sortValues,
-      rollup;
-
-  function map(array, depth) {
-    if (depth >= keys.length) return rollup
-        ? rollup.call(nest, array) : (sortValues
-        ? array.sort(sortValues)
-        : array);
-
-    var i = -1,
-        n = array.length,
-        key = keys[depth++],
-        keyValue,
-        object,
-        valuesByKey = new d3_Map,
-        values,
-        o = {};
-
-    while (++i < n) {
-      if (values = valuesByKey.get(keyValue = key(object = array[i]))) {
-        values.push(object);
-      } else {
-        valuesByKey.set(keyValue, [object]);
-      }
-    }
-
-    valuesByKey.forEach(function(keyValue) {
-      o[keyValue] = map(valuesByKey.get(keyValue), depth);
-    });
-
-    return o;
-  }
-
-  function entries(map, depth) {
-    if (depth >= keys.length) return map;
-
-    var a = [],
-        sortKey = sortKeys[depth++],
-        key;
-
-    for (key in map) {
-      a.push({key: key, values: entries(map[key], depth)});
-    }
-
-    if (sortKey) a.sort(function(a, b) {
-      return sortKey(a.key, b.key);
-    });
-
-    return a;
-  }
-
-  nest.map = function(array) {
-    return map(array, 0);
-  };
-
-  nest.entries = function(array) {
-    return entries(map(array, 0), 0);
-  };
-
-  nest.key = function(d) {
-    keys.push(d);
-    return nest;
-  };
-
-  // Specifies the order for the most-recently specified key.
-  // Note: only applies to entries. Map keys are unordered!
-  nest.sortKeys = function(order) {
-    sortKeys[keys.length - 1] = order;
-    return nest;
-  };
-
-  // Specifies the order for leaf values.
-  // Applies to both maps and entries array.
-  nest.sortValues = function(order) {
-    sortValues = order;
-    return nest;
-  };
-
-  nest.rollup = function(f) {
-    rollup = f;
-    return nest;
-  };
-
-  return nest;
-};
-d3.keys = function(map) {
-  var keys = [];
-  for (var key in map) keys.push(key);
-  return keys;
-};
-d3.values = function(map) {
-  var values = [];
-  for (var key in map) values.push(map[key]);
-  return values;
-};
-d3.entries = function(map) {
-  var entries = [];
-  for (var key in map) entries.push({key: key, value: map[key]});
-  return entries;
-};
-d3.permute = function(array, indexes) {
-  var permutes = [],
-      i = -1,
-      n = indexes.length;
-  while (++i < n) permutes[i] = array[indexes[i]];
-  return permutes;
-};
-d3.merge = function(arrays) {
-  return Array.prototype.concat.apply([], arrays);
-};
-d3.split = function(array, f) {
-  var arrays = [],
-      values = [],
-      value,
-      i = -1,
-      n = array.length;
-  if (arguments.length < 2) f = d3_splitter;
-  while (++i < n) {
-    if (f.call(values, value = array[i], i)) {
-      values = [];
-    } else {
-      if (!values.length) arrays.push(values);
-      values.push(value);
-    }
-  }
-  return arrays;
-};
-
-function d3_splitter(d) {
-  return d == null;
-}
-function d3_collapse(s) {
-  return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
-}
-d3.range = function(start, stop, step) {
-  if (arguments.length < 3) {
-    step = 1;
-    if (arguments.length < 2) {
-      stop = start;
-      start = 0;
-    }
-  }
-  if ((stop - start) / step === Infinity) throw new Error("infinite range");
-  var range = [],
-       k = d3_range_integerScale(Math.abs(step)),
-       i = -1,
-       j;
-  start *= k, stop *= k, step *= k;
-  if (step < 0) while ((j = start + step * ++i) > stop) range.push(j / k);
-  else while ((j = start + step * ++i) < stop) range.push(j / k);
-  return range;
-};
-
-function d3_range_integerScale(x) {
-  var k = 1;
-  while (x * k % 1) k *= 10;
-  return k;
-}
-d3.requote = function(s) {
-  return s.replace(d3_requote_re, "\\$&");
-};
-
-var d3_requote_re = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;
-d3.round = function(x, n) {
-  return n
-      ? Math.round(x * (n = Math.pow(10, n))) / n
-      : Math.round(x);
-};
-d3.xhr = function(url, mime, callback) {
-  var req = new XMLHttpRequest;
-  if (arguments.length < 3) callback = mime, mime = null;
-  else if (mime && req.overrideMimeType) req.overrideMimeType(mime);
-  req.open("GET", url, true);
-  if (mime) req.setRequestHeader("Accept", mime);
-  req.onreadystatechange = function() {
-    if (req.readyState === 4) callback(req.status < 300 ? req : null);
-  };
-  req.send(null);
-};
-d3.text = function(url, mime, callback) {
-  function ready(req) {
-    callback(req && req.responseText);
-  }
-  if (arguments.length < 3) {
-    callback = mime;
-    mime = null;
-  }
-  d3.xhr(url, mime, ready);
-};
-d3.json = function(url, callback) {
-  d3.text(url, "application/json", function(text) {
-    callback(text ? JSON.parse(text) : null);
-  });
-};
-d3.html = function(url, callback) {
-  d3.text(url, "text/html", function(text) {
-    if (text != null) { // Treat empty string as valid HTML.
-      var range = document.createRange();
-      range.selectNode(document.body);
-      text = range.createContextualFragment(text);
-    }
-    callback(text);
-  });
-};
-d3.xml = function(url, mime, callback) {
-  function ready(req) {
-    callback(req && req.responseXML);
-  }
-  if (arguments.length < 3) {
-    callback = mime;
-    mime = null;
-  }
-  d3.xhr(url, mime, ready);
-};
-var d3_nsPrefix = {
-  svg: "http://www.w3.org/2000/svg",
-  xhtml: "http://www.w3.org/1999/xhtml",
-  xlink: "http://www.w3.org/1999/xlink",
-  xml: "http://www.w3.org/XML/1998/namespace",
-  xmlns: "http://www.w3.org/2000/xmlns/"
-};
-
-d3.ns = {
-  prefix: d3_nsPrefix,
-  qualify: function(name) {
-    var i = name.indexOf(":"),
-        prefix = name;
-    if (i >= 0) {
-      prefix = name.substring(0, i);
-      name = name.substring(i + 1);
-    }
-    return d3_nsPrefix.hasOwnProperty(prefix)
-        ? {space: d3_nsPrefix[prefix], local: name}
-        : name;
-  }
-};
-d3.dispatch = function() {
-  var dispatch = new d3_dispatch,
-      i = -1,
-      n = arguments.length;
-  while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch);
-  return dispatch;
-};
-
-function d3_dispatch() {}
-
-d3_dispatch.prototype.on = function(type, listener) {
-  var i = type.indexOf("."),
-      name = "";
-
-  // Extract optional namespace, e.g., "click.foo"
-  if (i > 0) {
-    name = type.substring(i + 1);
-    type = type.substring(0, i);
-  }
-
-  return arguments.length < 2
-      ? this[type].on(name)
-      : this[type].on(name, listener);
-};
-
-function d3_dispatch_event(dispatch) {
-  var listeners = [],
-      listenerByName = new d3_Map;
-
-  function event() {
-    var z = listeners, // defensive reference
-        i = -1,
-        n = z.length,
-        l;
-    while (++i < n) if (l = z[i].on) l.apply(this, arguments);
-    return dispatch;
-  }
-
-  event.on = function(name, listener) {
-    var l = listenerByName.get(name),
-        i;
-
-    // return the current listener, if any
-    if (arguments.length < 2) return l && l.on;
-
-    // remove the old listener, if any (with copy-on-write)
-    if (l) {
-      l.on = null;
-      listeners = listeners.slice(0, i = listeners.indexOf(l)).concat(listeners.slice(i + 1));
-      listenerByName.remove(name);
-    }
-
-    // add the new listener, if any
-    if (listener) listeners.push(listenerByName.set(name, {on: listener}));
-
-    return dispatch;
-  };
-
-  return event;
-}
-// TODO align
-d3.format = function(specifier) {
-  var match = d3_format_re.exec(specifier),
-      fill = match[1] || " ",
-      sign = match[3] || "",
-      zfill = match[5],
-      width = +match[6],
-      comma = match[7],
-      precision = match[8],
-      type = match[9],
-      scale = 1,
-      suffix = "",
-      integer = false;
-
-  if (precision) precision = +precision.substring(1);
-
-  if (zfill) {
-    fill = "0"; // TODO align = "=";
-    if (comma) width -= Math.floor((width - 1) / 4);
-  }
-
-  switch (type) {
-    case "n": comma = true; type = "g"; break;
-    case "%": scale = 100; suffix = "%"; type = "f"; break;
-    case "p": scale = 100; suffix = "%"; type = "r"; break;
-    case "d": integer = true; precision = 0; break;
-    case "s": scale = -1; type = "r"; break;
-  }
-
-  // If no precision is specified for r, fallback to general notation.
-  if (type == "r" && !precision) type = "g";
-
-  type = d3_format_types.get(type) || d3_format_typeDefault;
-
-  return function(value) {
-
-    // Return the empty string for floats formatted as ints.
-    if (integer && (value % 1)) return "";
-
-    // Convert negative to positive, and record the sign prefix.
-    var negative = (value < 0) && (value = -value) ? "\u2212" : sign;
-
-    // Apply the scale, computing it from the value's exponent for si format.
-    if (scale < 0) {
-      var prefix = d3.formatPrefix(value, precision);
-      value *= prefix.scale;
-      suffix = prefix.symbol;
-    } else {
-      value *= scale;
-    }
-
-    // Convert to the desired precision.
-    value = type(value, precision);
-
-    // If the fill character is 0, the sign and group is applied after the fill.
-    if (zfill) {
-      var length = value.length + negative.length;
-      if (length < width) value = new Array(width - length + 1).join(fill) + value;
-      if (comma) value = d3_format_group(value);
-      value = negative + value;
-    }
-
-    // Otherwise (e.g., space-filling), the sign and group is applied before.
-    else {
-      if (comma) value = d3_format_group(value);
-      value = negative + value;
-      var length = value.length;
-      if (length < width) value = new Array(width - length + 1).join(fill) + value;
-    }
-
-    return value + suffix;
-  };
-};
-
-// [[fill]align][sign][#][0][width][,][.precision][type]
-var d3_format_re = /(?:([^{])?([<>=^]))?([+\- ])?(#)?(0)?([0-9]+)?(,)?(\.[0-9]+)?([a-zA-Z%])?/;
-
-var d3_format_types = d3.map({
-  g: function(x, p) { return x.toPrecision(p); },
-  e: function(x, p) { return x.toExponential(p); },
-  f: function(x, p) { return x.toFixed(p); },
-  r: function(x, p) { return d3.round(x, p = d3_format_precision(x, p)).toFixed(Math.max(0, Math.min(20, p))); }
-});
-
-function d3_format_precision(x, p) {
-  return p - (x ? 1 + Math.floor(Math.log(x + Math.pow(10, 1 + Math.floor(Math.log(x) / Math.LN10) - p)) / Math.LN10) : 1);
-}
-
-function d3_format_typeDefault(x) {
-  return x + "";
-}
-
-// Apply comma grouping for thousands.
-function d3_format_group(value) {
-  var i = value.lastIndexOf("."),
-      f = i >= 0 ? value.substring(i) : (i = value.length, ""),
-      t = [];
-  while (i > 0) t.push(value.substring(i -= 3, i + 3));
-  return t.reverse().join(",") + f;
-}
-var d3_formatPrefixes = ["y","z","a","f","p","n","μ","m","","k","M","G","T","P","E","Z","Y"].map(d3_formatPrefix);
-
-d3.formatPrefix = function(value, precision) {
-  var i = 0;
-  if (value) {
-    if (value < 0) value *= -1;
-    if (precision) value = d3.round(value, d3_format_precision(value, precision));
-    i = 1 + Math.floor(1e-12 + Math.log(value) / Math.LN10);
-    i = Math.max(-24, Math.min(24, Math.floor((i <= 0 ? i + 1 : i - 1) / 3) * 3));
-  }
-  return d3_formatPrefixes[8 + i / 3];
-};
-
-function d3_formatPrefix(d, i) {
-  return {
-    scale: Math.pow(10, (8 - i) * 3),
-    symbol: d
-  };
-}
-
-/*
- * TERMS OF USE - EASING EQUATIONS
- *
- * Open source under the BSD License.
- *
- * Copyright 2001 Robert Penner
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * - Redistributions of source code must retain the above copyright notice, this
- *   list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright notice,
- *   this list of conditions and the following disclaimer in the documentation
- *   and/or other materials provided with the distribution.
- *
- * - Neither the name of the author nor the names of contributors may be used to
- *   endorse or promote products derived from this software without specific
- *   prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-var d3_ease_quad = d3_ease_poly(2),
-    d3_ease_cubic = d3_ease_poly(3),
-    d3_ease_default = function() { return d3_ease_identity; };
-
-var d3_ease = d3.map({
-  linear: d3_ease_default,
-  poly: d3_ease_poly,
-  quad: function() { return d3_ease_quad; },
-  cubic: function() { return d3_ease_cubic; },
-  sin: function() { return d3_ease_sin; },
-  exp: function() { return d3_ease_exp; },
-  circle: function() { return d3_ease_circle; },
-  elastic: d3_ease_elastic,
-  back: d3_ease_back,
-  bounce: function() { return d3_ease_bounce; }
-});
-
-var d3_ease_mode = d3.map({
-  "in": d3_ease_identity,
-  "out": d3_ease_reverse,
-  "in-out": d3_ease_reflect,
-  "out-in": function(f) { return d3_ease_reflect(d3_ease_reverse(f)); }
-});
-
-d3.ease = function(name) {
-  var i = name.indexOf("-"),
-      t = i >= 0 ? name.substring(0, i) : name,
-      m = i >= 0 ? name.substring(i + 1) : "in";
-  t = d3_ease.get(t) || d3_ease_default;
-  m = d3_ease_mode.get(m) || d3_ease_identity;
-  return d3_ease_clamp(m(t.apply(null, Array.prototype.slice.call(arguments, 1))));
-};
-
-function d3_ease_clamp(f) {
-  return function(t) {
-    return t <= 0 ? 0 : t >= 1 ? 1 : f(t);
-  };
-}
-
-function d3_ease_reverse(f) {
-  return function(t) {
-    return 1 - f(1 - t);
-  };
-}
-
-function d3_ease_reflect(f) {
-  return function(t) {
-    return .5 * (t < .5 ? f(2 * t) : (2 - f(2 - 2 * t)));
-  };
-}
-
-function d3_ease_identity(t) {
-  return t;
-}
-
-function d3_ease_poly(e) {
-  return function(t) {
-    return Math.pow(t, e);
-  };
-}
-
-function d3_ease_sin(t) {
-  return 1 - Math.cos(t * Math.PI / 2);
-}
-
-function d3_ease_exp(t) {
-  return Math.pow(2, 10 * (t - 1));
-}
-
-function d3_ease_circle(t) {
-  return 1 - Math.sqrt(1 - t * t);
-}
-
-function d3_ease_elastic(a, p) {
-  var s;
-  if (arguments.length < 2) p = 0.45;
-  if (arguments.length < 1) { a = 1; s = p / 4; }
-  else s = p / (2 * Math.PI) * Math.asin(1 / a);
-  return function(t) {
-    return 1 + a * Math.pow(2, 10 * -t) * Math.sin((t - s) * 2 * Math.PI / p);
-  };
-}
-
-function d3_ease_back(s) {
-  if (!s) s = 1.70158;
-  return function(t) {
-    return t * t * ((s + 1) * t - s);
-  };
-}
-
-function d3_ease_bounce(t) {
-  return t < 1 / 2.75 ? 7.5625 * t * t
-      : t < 2 / 2.75 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75
-      : t < 2.5 / 2.75 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375
-      : 7.5625 * (t -= 2.625 / 2.75) * t + .984375;
-}
-d3.event = null;
-
-function d3_eventCancel() {
-  d3.event.stopPropagation();
-  d3.event.preventDefault();
-}
-
-function d3_eventSource() {
-  var e = d3.event, s;
-  while (s = e.sourceEvent) e = s;
-  return e;
-}
-
-// Like d3.dispatch, but for custom events abstracting native UI events. These
-// events have a target component (such as a brush), a target element (such as
-// the svg:g element containing the brush) and the standard arguments `d` (the
-// target element's data) and `i` (the selection index of the target element).
-function d3_eventDispatch(target) {
-  var dispatch = new d3_dispatch,
-      i = 0,
-      n = arguments.length;
-
-  while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch);
-
-  // Creates a dispatch context for the specified `thiz` (typically, the target
-  // DOM element that received the source event) and `argumentz` (typically, the
-  // data `d` and index `i` of the target element). The returned function can be
-  // used to dispatch an event to any registered listeners; the function takes a
-  // single argument as input, being the event to dispatch. The event must have
-  // a "type" attribute which corresponds to a type registered in the
-  // constructor. This context will automatically populate the "sourceEvent" and
-  // "target" attributes of the event, as well as setting the `d3.event` global
-  // for the duration of the notification.
-  dispatch.of = function(thiz, argumentz) {
-    return function(e1) {
-      try {
-        var e0 =
-        e1.sourceEvent = d3.event;
-        e1.target = target;
-        d3.event = e1;
-        dispatch[e1.type].apply(thiz, argumentz);
-      } finally {
-        d3.event = e0;
-      }
-    };
-  };
-
-  return dispatch;
-}
-d3.interpolate = function(a, b) {
-  var i = d3.interpolators.length, f;
-  while (--i >= 0 && !(f = d3.interpolators[i](a, b)));
-  return f;
-};
-
-d3.interpolateNumber = function(a, b) {
-  b -= a;
-  return function(t) { return a + b * t; };
-};
-
-d3.interpolateRound = function(a, b) {
-  b -= a;
-  return function(t) { return Math.round(a + b * t); };
-};
-
-d3.interpolateString = function(a, b) {
-  var m, // current match
-      i, // current index
-      j, // current index (for coallescing)
-      s0 = 0, // start index of current string prefix
-      s1 = 0, // end index of current string prefix
-      s = [], // string constants and placeholders
-      q = [], // number interpolators
-      n, // q.length
-      o;
-
-  // Reset our regular expression!
-  d3_interpolate_number.lastIndex = 0;
-
-  // Find all numbers in b.
-  for (i = 0; m = d3_interpolate_number.exec(b); ++i) {
-    if (m.index) s.push(b.substring(s0, s1 = m.index));
-    q.push({i: s.length, x: m[0]});
-    s.push(null);
-    s0 = d3_interpolate_number.lastIndex;
-  }
-  if (s0 < b.length) s.push(b.substring(s0));
-
-  // Find all numbers in a.
-  for (i = 0, n = q.length; (m = d3_interpolate_number.exec(a)) && i < n; ++i) {
-    o = q[i];
-    if (o.x == m[0]) { // The numbers match, so coallesce.
-      if (o.i) {
-        if (s[o.i + 1] == null) { // This match is followed by another number.
-          s[o.i - 1] += o.x;
-          s.splice(o.i, 1);
-          for (j = i + 1; j < n; ++j) q[j].i--;
-        } else { // This match is followed by a string, so coallesce twice.
-          s[o.i - 1] += o.x + s[o.i + 1];
-          s.splice(o.i, 2);
-          for (j = i + 1; j < n; ++j) q[j].i -= 2;
-        }
-      } else {
-          if (s[o.i + 1] == null) { // This match is followed by another number.
-          s[o.i] = o.x;
-        } else { // This match is followed by a string, so coallesce twice.
-          s[o.i] = o.x + s[o.i + 1];
-          s.splice(o.i + 1, 1);
-          for (j = i + 1; j < n; ++j) q[j].i--;
-        }
-      }
-      q.splice(i, 1);
-      n--;
-      i--;
-    } else {
-      o.x = d3.interpolateNumber(parseFloat(m[0]), parseFloat(o.x));
-    }
-  }
-
-  // Remove any numbers in b not found in a.
-  while (i < n) {
-    o = q.pop();
-    if (s[o.i + 1] == null) { // This match is followed by another number.
-      s[o.i] = o.x;
-    } else { // This match is followed by a string, so coallesce twice.
-      s[o.i] = o.x + s[o.i + 1];
-      s.splice(o.i + 1, 1);
-    }
-    n--;
-  }
-
-  // Special optimization for only a single match.
-  if (s.length === 1) {
-    return s[0] == null ? q[0].x : function() { return b; };
-  }
-
-  // Otherwise, interpolate each of the numbers and rejoin the string.
-  return function(t) {
-    for (i = 0; i < n; ++i) s[(o = q[i]).i] = o.x(t);
-    return s.join("");
-  };
-};
-
-d3.interpolateTransform = function(a, b) {
-  var s = [], // string constants and placeholders
-      q = [], // number interpolators
-      n,
-      A = d3.transform(a),
-      B = d3.transform(b),
-      ta = A.translate,
-      tb = B.translate,
-      ra = A.rotate,
-      rb = B.rotate,
-      wa = A.skew,
-      wb = B.skew,
-      ka = A.scale,
-      kb = B.scale;
-
-  if (ta[0] != tb[0] || ta[1] != tb[1]) {
-    s.push("translate(", null, ",", null, ")");
-    q.push({i: 1, x: d3.interpolateNumber(ta[0], tb[0])}, {i: 3, x: d3.interpolateNumber(ta[1], tb[1])});
-  } else if (tb[0] || tb[1]) {
-    s.push("translate(" + tb + ")");
-  } else {
-    s.push("");
-  }
-
-  if (ra != rb) {
-    q.push({i: s.push(s.pop() + "rotate(", null, ")") - 2, x: d3.interpolateNumber(ra, rb)});
-  } else if (rb) {
-    s.push(s.pop() + "rotate(" + rb + ")");
-  }
-
-  if (wa != wb) {
-    q.push({i: s.push(s.pop() + "skewX(", null, ")") - 2, x: d3.interpolateNumber(wa, wb)});
-  } else if (wb) {
-    s.push(s.pop() + "skewX(" + wb + ")");
-  }
-
-  if (ka[0] != kb[0] || ka[1] != kb[1]) {
-    n = s.push(s.pop() + "scale(", null, ",", null, ")");
-    q.push({i: n - 4, x: d3.interpolateNumber(ka[0], kb[0])}, {i: n - 2, x: d3.interpolateNumber(ka[1], kb[1])});
-  } else if (kb[0] != 1 || kb[1] != 1) {
-    s.push(s.pop() + "scale(" + kb + ")");
-  }
-
-  n = q.length;
-  return function(t) {
-    var i = -1, o;
-    while (++i < n) s[(o = q[i]).i] = o.x(t);
-    return s.join("");
-  };
-};
-
-d3.interpolateRgb = function(a, b) {
-  a = d3.rgb(a);
-  b = d3.rgb(b);
-  var ar = a.r,
-      ag = a.g,
-      ab = a.b,
-      br = b.r - ar,
-      bg = b.g - ag,
-      bb = b.b - ab;
-  return function(t) {
-    return "#"
-        + d3_rgb_hex(Math.round(ar + br * t))
-        + d3_rgb_hex(Math.round(ag + bg * t))
-        + d3_rgb_hex(Math.round(ab + bb * t));
-  };
-};
-
-// interpolates HSL space, but outputs RGB string (for compatibility)
-d3.interpolateHsl = function(a, b) {
-  a = d3.hsl(a);
-  b = d3.hsl(b);
-  var h0 = a.h,
-      s0 = a.s,
-      l0 = a.l,
-      h1 = b.h - h0,
-      s1 = b.s - s0,
-      l1 = b.l - l0;
-  return function(t) {
-    return d3_hsl_rgb(h0 + h1 * t, s0 + s1 * t, l0 + l1 * t).toString();
-  };
-};
-
-d3.interpolateArray = function(a, b) {
-  var x = [],
-      c = [],
-      na = a.length,
-      nb = b.length,
-      n0 = Math.min(a.length, b.length),
-      i;
-  for (i = 0; i < n0; ++i) x.push(d3.interpolate(a[i], b[i]));
-  for (; i < na; ++i) c[i] = a[i];
-  for (; i < nb; ++i) c[i] = b[i];
-  return function(t) {
-    for (i = 0; i < n0; ++i) c[i] = x[i](t);
-    return c;
-  };
-};
-
-d3.interpolateObject = function(a, b) {
-  var i = {},
-      c = {},
-      k;
-  for (k in a) {
-    if (k in b) {
-      i[k] = d3_interpolateByName(k)(a[k], b[k]);
-    } else {
-      c[k] = a[k];
-    }
-  }
-  for (k in b) {
-    if (!(k in a)) {
-      c[k] = b[k];
-    }
-  }
-  return function(t) {
-    for (k in i) c[k] = i[k](t);
-    return c;
-  };
-}
-
-var d3_interpolate_number = /[-+]?(?:\d*\.?\d+)(?:[eE][-+]?\d+)?/g;
-
-function d3_interpolateByName(n) {
-  return n == "transform"
-      ? d3.interpolateTransform
-      : d3.interpolate;
-}
-
-d3.interpolators = [
-  d3.interpolateObject,
-  function(a, b) { return (b instanceof Array) && d3.interpolateArray(a, b); },
-  function(a, b) { return (typeof a === "string" || typeof b === "string") && d3.interpolateString(a + "", b + ""); },
-  function(a, b) { return (typeof b === "string" ? d3_rgb_names.has(b) || /^(#|rgb\(|hsl\()/.test(b) : b instanceof d3_Rgb || b instanceof d3_Hsl) && d3.interpolateRgb(a, b); },
-  function(a, b) { return !isNaN(a = +a) && !isNaN(b = +b) && d3.interpolateNumber(a, b); }
-];
-function d3_uninterpolateNumber(a, b) {
-  b = b - (a = +a) ? 1 / (b - a) : 0;
-  return function(x) { return (x - a) * b; };
-}
-
-function d3_uninterpolateClamp(a, b) {
-  b = b - (a = +a) ? 1 / (b - a) : 0;
-  return function(x) { return Math.max(0, Math.min(1, (x - a) * b)); };
-}
-d3.rgb = function(r, g, b) {
-  return arguments.length === 1
-      ? (r instanceof d3_Rgb ? d3_rgb(r.r, r.g, r.b)
-      : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb))
-      : d3_rgb(~~r, ~~g, ~~b);
-};
-
-function d3_rgb(r, g, b) {
-  return new d3_Rgb(r, g, b);
-}
-
-function d3_Rgb(r, g, b) {
-  this.r = r;
-  this.g = g;
-  this.b = b;
-}
-
-d3_Rgb.prototype.brighter = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  var r = this.r,
-      g = this.g,
-      b = this.b,
-      i = 30;
-  if (!r && !g && !b) return d3_rgb(i, i, i);
-  if (r && r < i) r = i;
-  if (g && g < i) g = i;
-  if (b && b < i) b = i;
-  return d3_rgb(
-      Math.min(255, Math.floor(r / k)),
-      Math.min(255, Math.floor(g / k)),
-      Math.min(255, Math.floor(b / k)));
-};
-
-d3_Rgb.prototype.darker = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_rgb(
-      Math.floor(k * this.r),
-      Math.floor(k * this.g),
-      Math.floor(k * this.b));
-};
-
-d3_Rgb.prototype.hsl = function() {
-  return d3_rgb_hsl(this.r, this.g, this.b);
-};
-
-d3_Rgb.prototype.toString = function() {
-  return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b);
-};
-
-function d3_rgb_hex(v) {
-  return v < 0x10
-      ? "0" + Math.max(0, v).toString(16)
-      : Math.min(255, v).toString(16);
-}
-
-function d3_rgb_parse(format, rgb, hsl) {
-  var r = 0, // red channel; int in [0, 255]
-      g = 0, // green channel; int in [0, 255]
-      b = 0, // blue channel; int in [0, 255]
-      m1, // CSS color specification match
-      m2, // CSS color specification type (e.g., rgb)
-      name;
-
-  /* Handle hsl, rgb. */
-  m1 = /([a-z]+)\((.*)\)/i.exec(format);
-  if (m1) {
-    m2 = m1[2].split(",");
-    switch (m1[1]) {
-      case "hsl": {
-        return hsl(
-          parseFloat(m2[0]), // degrees
-          parseFloat(m2[1]) / 100, // percentage
-          parseFloat(m2[2]) / 100 // percentage
-        );
-      }
-      case "rgb": {
-        return rgb(
-          d3_rgb_parseNumber(m2[0]),
-          d3_rgb_parseNumber(m2[1]),
-          d3_rgb_parseNumber(m2[2])
-        );
-      }
-    }
-  }
-
-  /* Named colors. */
-  if (name = d3_rgb_names.get(format)) return rgb(name.r, name.g, name.b);
-
-  /* Hexadecimal colors: #rgb and #rrggbb. */
-  if (format != null && format.charAt(0) === "#") {
-    if (format.length === 4) {
-      r = format.charAt(1); r += r;
-      g = format.charAt(2); g += g;
-      b = format.charAt(3); b += b;
-    } else if (format.length === 7) {
-      r = format.substring(1, 3);
-      g = format.substring(3, 5);
-      b = format.substring(5, 7);
-    }
-    r = parseInt(r, 16);
-    g = parseInt(g, 16);
-    b = parseInt(b, 16);
-  }
-
-  return rgb(r, g, b);
-}
-
-function d3_rgb_hsl(r, g, b) {
-  var min = Math.min(r /= 255, g /= 255, b /= 255),
-      max = Math.max(r, g, b),
-      d = max - min,
-      h,
-      s,
-      l = (max + min) / 2;
-  if (d) {
-    s = l < .5 ? d / (max + min) : d / (2 - max - min);
-    if (r == max) h = (g - b) / d + (g < b ? 6 : 0);
-    else if (g == max) h = (b - r) / d + 2;
-    else h = (r - g) / d + 4;
-    h *= 60;
-  } else {
-    s = h = 0;
-  }
-  return d3_hsl(h, s, l);
-}
-
-function d3_rgb_parseNumber(c) { // either integer or percentage
-  var f = parseFloat(c);
-  return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f;
-}
-
-var d3_rgb_names = d3.map({
-  aliceblue: "#f0f8ff",
-  antiquewhite: "#faebd7",
-  aqua: "#00ffff",
-  aquamarine: "#7fffd4",
-  azure: "#f0ffff",
-  beige: "#f5f5dc",
-  bisque: "#ffe4c4",
-  black: "#000000",
-  blanchedalmond: "#ffebcd",
-  blue: "#0000ff",
-  blueviolet: "#8a2be2",
-  brown: "#a52a2a",
-  burlywood: "#deb887",
-  cadetblue: "#5f9ea0",
-  chartreuse: "#7fff00",
-  chocolate: "#d2691e",
-  coral: "#ff7f50",
-  cornflowerblue: "#6495ed",
-  cornsilk: "#fff8dc",
-  crimson: "#dc143c",
-  cyan: "#00ffff",
-  darkblue: "#00008b",
-  darkcyan: "#008b8b",
-  darkgoldenrod: "#b8860b",
-  darkgray: "#a9a9a9",
-  darkgreen: "#006400",
-  darkgrey: "#a9a9a9",
-  darkkhaki: "#bdb76b",
-  darkmagenta: "#8b008b",
-  darkolivegreen: "#556b2f",
-  darkorange: "#ff8c00",
-  darkorchid: "#9932cc",
-  darkred: "#8b0000",
-  darksalmon: "#e9967a",
-  darkseagreen: "#8fbc8f",
-  darkslateblue: "#483d8b",
-  darkslategray: "#2f4f4f",
-  darkslategrey: "#2f4f4f",
-  darkturquoise: "#00ced1",
-  darkviolet: "#9400d3",
-  deeppink: "#ff1493",
-  deepskyblue: "#00bfff",
-  dimgray: "#696969",
-  dimgrey: "#696969",
-  dodgerblue: "#1e90ff",
-  firebrick: "#b22222",
-  floralwhite: "#fffaf0",
-  forestgreen: "#228b22",
-  fuchsia: "#ff00ff",
-  gainsboro: "#dcdcdc",
-  ghostwhite: "#f8f8ff",
-  gold: "#ffd700",
-  goldenrod: "#daa520",
-  gray: "#808080",
-  green: "#008000",
-  greenyellow: "#adff2f",
-  grey: "#808080",
-  honeydew: "#f0fff0",
-  hotpink: "#ff69b4",
-  indianred: "#cd5c5c",
-  indigo: "#4b0082",
-  ivory: "#fffff0",
-  khaki: "#f0e68c",
-  lavender: "#e6e6fa",
-  lavenderblush: "#fff0f5",
-  lawngreen: "#7cfc00",
-  lemonchiffon: "#fffacd",
-  lightblue: "#add8e6",
-  lightcoral: "#f08080",
-  lightcyan: "#e0ffff",
-  lightgoldenrodyellow: "#fafad2",
-  lightgray: "#d3d3d3",
-  lightgreen: "#90ee90",
-  lightgrey: "#d3d3d3",
-  lightpink: "#ffb6c1",
-  lightsalmon: "#ffa07a",
-  lightseagreen: "#20b2aa",
-  lightskyblue: "#87cefa",
-  lightslategray: "#778899",
-  lightslategrey: "#778899",
-  lightsteelblue: "#b0c4de",
-  lightyellow: "#ffffe0",
-  lime: "#00ff00",
-  limegreen: "#32cd32",
-  linen: "#faf0e6",
-  magenta: "#ff00ff",
-  maroon: "#800000",
-  mediumaquamarine: "#66cdaa",
-  mediumblue: "#0000cd",
-  mediumorchid: "#ba55d3",
-  mediumpurple: "#9370db",
-  mediumseagreen: "#3cb371",
-  mediumslateblue: "#7b68ee",
-  mediumspringgreen: "#00fa9a",
-  mediumturquoise: "#48d1cc",
-  mediumvioletred: "#c71585",
-  midnightblue: "#191970",
-  mintcream: "#f5fffa",
-  mistyrose: "#ffe4e1",
-  moccasin: "#ffe4b5",
-  navajowhite: "#ffdead",
-  navy: "#000080",
-  oldlace: "#fdf5e6",
-  olive: "#808000",
-  olivedrab: "#6b8e23",
-  orange: "#ffa500",
-  orangered: "#ff4500",
-  orchid: "#da70d6",
-  palegoldenrod: "#eee8aa",
-  palegreen: "#98fb98",
-  paleturquoise: "#afeeee",
-  palevioletred: "#db7093",
-  papayawhip: "#ffefd5",
-  peachpuff: "#ffdab9",
-  peru: "#cd853f",
-  pink: "#ffc0cb",
-  plum: "#dda0dd",
-  powderblue: "#b0e0e6",
-  purple: "#800080",
-  red: "#ff0000",
-  rosybrown: "#bc8f8f",
-  royalblue: "#4169e1",
-  saddlebrown: "#8b4513",
-  salmon: "#fa8072",
-  sandybrown: "#f4a460",
-  seagreen: "#2e8b57",
-  seashell: "#fff5ee",
-  sienna: "#a0522d",
-  silver: "#c0c0c0",
-  skyblue: "#87ceeb",
-  slateblue: "#6a5acd",
-  slategray: "#708090",
-  slategrey: "#708090",
-  snow: "#fffafa",
-  springgreen: "#00ff7f",
-  steelblue: "#4682b4",
-  tan: "#d2b48c",
-  teal: "#008080",
-  thistle: "#d8bfd8",
-  tomato: "#ff6347",
-  turquoise: "#40e0d0",
-  violet: "#ee82ee",
-  wheat: "#f5deb3",
-  white: "#ffffff",
-  whitesmoke: "#f5f5f5",
-  yellow: "#ffff00",
-  yellowgreen: "#9acd32"
-});
-
-d3_rgb_names.forEach(function(key, value) {
-  d3_rgb_names.set(key, d3_rgb_parse(value, d3_rgb, d3_hsl_rgb));
-});
-d3.hsl = function(h, s, l) {
-  return arguments.length === 1
-      ? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l)
-      : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl))
-      : d3_hsl(+h, +s, +l);
-};
-
-function d3_hsl(h, s, l) {
-  return new d3_Hsl(h, s, l);
-}
-
-function d3_Hsl(h, s, l) {
-  this.h = h;
-  this.s = s;
-  this.l = l;
-}
-
-d3_Hsl.prototype.brighter = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_hsl(this.h, this.s, this.l / k);
-};
-
-d3_Hsl.prototype.darker = function(k) {
-  k = Math.pow(0.7, arguments.length ? k : 1);
-  return d3_hsl(this.h, this.s, k * this.l);
-};
-
-d3_Hsl.prototype.rgb = function() {
-  return d3_hsl_rgb(this.h, this.s, this.l);
-};
-
-d3_Hsl.prototype.toString = function() {
-  return this.rgb().toString();
-};
-
-function d3_hsl_rgb(h, s, l) {
-  var m1,
-      m2;
-
-  /* Some simple corrections for h, s and l. */
-  h = h % 360; if (h < 0) h += 360;
-  s = s < 0 ? 0 : s > 1 ? 1 : s;
-  l = l < 0 ? 0 : l > 1 ? 1 : l;
-
-  /* From FvD 13.37, CSS Color Module Level 3 */
-  m2 = l <= .5 ? l * (1 + s) : l + s - l * s;
-  m1 = 2 * l - m2;
-
-  function v(h) {
-    if (h > 360) h -= 360;
-    else if (h < 0) h += 360;
-    if (h < 60) return m1 + (m2 - m1) * h / 60;
-    if (h < 180) return m2;
-    if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;
-    return m1;
-  }
-
-  function vv(h) {
-    return Math.round(v(h) * 255);
-  }
-
-  return d3_rgb(vv(h + 120), vv(h), vv(h - 120));
-}
-function d3_selection(groups) {
-  d3_arraySubclass(groups, d3_selectionPrototype);
-  return groups;
-}
-
-var d3_select = function(s, n) { return n.querySelector(s); },
-    d3_selectAll = function(s, n) { return n.querySelectorAll(s); },
-    d3_selectRoot = document.documentElement,
-    d3_selectMatcher = d3_selectRoot.matchesSelector || d3_selectRoot.webkitMatchesSelector || d3_selectRoot.mozMatchesSelector || d3_selectRoot.msMatchesSelector || d3_selectRoot.oMatchesSelector,
-    d3_selectMatches = function(n, s) { return d3_selectMatcher.call(n, s); };
-
-// Prefer Sizzle, if available.
-if (typeof Sizzle === "function") {
-  d3_select = function(s, n) { return Sizzle(s, n)[0]; };
-  d3_selectAll = function(s, n) { return Sizzle.uniqueSort(Sizzle(s, n)); };
-  d3_selectMatches = Sizzle.matchesSelector;
-}
-
-var d3_selectionPrototype = [];
-
-d3.selection = function() {
-  return d3_selectionRoot;
-};
-
-d3.selection.prototype = d3_selectionPrototype;
-d3_selectionPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      group,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selector(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = (group = this[j]).parentNode;
-    for (var i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroup.push(subnode = selector.call(node, node.__data__, i));
-        if (subnode && "__data__" in node) subnode.__data__ = node.__data__;
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_selector(selector) {
-  return function() {
-    return d3_select(selector, this);
-  };
-}
-d3_selectionPrototype.selectAll = function(selector) {
-  var subgroups = [],
-      subgroup,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroups.push(subgroup = d3_array(selector.call(node, node.__data__, i)));
-        subgroup.parentNode = node;
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_selectorAll(selector) {
-  return function() {
-    return d3_selectAll(selector, this);
-  };
-}
-d3_selectionPrototype.attr = function(name, value) {
-  name = d3.ns.qualify(name);
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) {
-    var node = this.node();
-    return name.local
-        ? node.getAttributeNS(name.space, name.local)
-        : node.getAttribute(name);
-  }
-
-  function attrNull() {
-    this.removeAttribute(name);
-  }
-
-  function attrNullNS() {
-    this.removeAttributeNS(name.space, name.local);
-  }
-
-  function attrConstant() {
-    this.setAttribute(name, value);
-  }
-
-  function attrConstantNS() {
-    this.setAttributeNS(name.space, name.local, value);
-  }
-
-  function attrFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.removeAttribute(name);
-    else this.setAttribute(name, x);
-  }
-
-  function attrFunctionNS() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.removeAttributeNS(name.space, name.local);
-    else this.setAttributeNS(name.space, name.local, x);
-  }
-
-  return this.each(value == null
-      ? (name.local ? attrNullNS : attrNull) : (typeof value === "function"
-      ? (name.local ? attrFunctionNS : attrFunction)
-      : (name.local ? attrConstantNS : attrConstant)));
-};
-d3_selectionPrototype.classed = function(name, value) {
-  var names = name.split(d3_selection_classedWhitespace),
-      n = names.length,
-      i = -1;
-  if (arguments.length > 1) {
-    while (++i < n) d3_selection_classed.call(this, names[i], value);
-    return this;
-  } else {
-    while (++i < n) if (!d3_selection_classed.call(this, names[i])) return false;
-    return true;
-  }
-};
-
-var d3_selection_classedWhitespace = /\s+/g;
-
-function d3_selection_classed(name, value) {
-  var re = new RegExp("(^|\\s+)" + d3.requote(name) + "(\\s+|$)", "g");
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) {
-    var node = this.node();
-    if (c = node.classList) return c.contains(name);
-    var c = node.className;
-    re.lastIndex = 0;
-    return re.test(c.baseVal != null ? c.baseVal : c);
-  }
-
-  function classedAdd() {
-    if (c = this.classList) return c.add(name);
-    var c = this.className,
-        cb = c.baseVal != null,
-        cv = cb ? c.baseVal : c;
-    re.lastIndex = 0;
-    if (!re.test(cv)) {
-      cv = d3_collapse(cv + " " + name);
-      if (cb) c.baseVal = cv;
-      else this.className = cv;
-    }
-  }
-
-  function classedRemove() {
-    if (c = this.classList) return c.remove(name);
-    var c = this.className,
-        cb = c.baseVal != null,
-        cv = cb ? c.baseVal : c;
-    cv = d3_collapse(cv.replace(re, " "));
-    if (cb) c.baseVal = cv;
-    else this.className = cv;
-  }
-
-  function classedFunction() {
-    (value.apply(this, arguments)
-        ? classedAdd
-        : classedRemove).call(this);
-  }
-
-  return this.each(typeof value === "function"
-      ? classedFunction : value
-      ? classedAdd
-      : classedRemove);
-}
-d3_selectionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = "";
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) return window
-      .getComputedStyle(this.node(), null)
-      .getPropertyValue(name);
-
-  function styleNull() {
-    this.style.removeProperty(name);
-  }
-
-  function styleConstant() {
-    this.style.setProperty(name, value, priority);
-  }
-
-  function styleFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) this.style.removeProperty(name);
-    else this.style.setProperty(name, x, priority);
-  }
-
-  return this.each(value == null
-      ? styleNull : (typeof value === "function"
-      ? styleFunction : styleConstant));
-};
-d3_selectionPrototype.property = function(name, value) {
-
-  // If no value is specified, return the first value.
-  if (arguments.length < 2) return this.node()[name];
-
-  function propertyNull() {
-    delete this[name];
-  }
-
-  function propertyConstant() {
-    this[name] = value;
-  }
-
-  function propertyFunction() {
-    var x = value.apply(this, arguments);
-    if (x == null) delete this[name];
-    else this[name] = x;
-  }
-
-  return this.each(value == null
-      ? propertyNull : (typeof value === "function"
-      ? propertyFunction : propertyConstant));
-};
-d3_selectionPrototype.text = function(value) {
-  return arguments.length < 1
-      ? this.node().textContent : this.each(typeof value === "function"
-      ? function() { var v = value.apply(this, arguments); this.textContent = v == null ? "" : v; } : value == null
-      ? function() { this.textContent = ""; }
-      : function() { this.textContent = value; });
-};
-d3_selectionPrototype.html = function(value) {
-  return arguments.length < 1
-      ? this.node().innerHTML : this.each(typeof value === "function"
-      ? function() { var v = value.apply(this, arguments); this.innerHTML = v == null ? "" : v; } : value == null
-      ? function() { this.innerHTML = ""; }
-      : function() { this.innerHTML = value; });
-};
-// TODO append(node)?
-// TODO append(function)?
-d3_selectionPrototype.append = function(name) {
-  name = d3.ns.qualify(name);
-
-  function append() {
-    return this.appendChild(document.createElementNS(this.namespaceURI, name));
-  }
-
-  function appendNS() {
-    return this.appendChild(document.createElementNS(name.space, name.local));
-  }
-
-  return this.select(name.local ? appendNS : append);
-};
-// TODO insert(node, function)?
-// TODO insert(function, string)?
-// TODO insert(function, function)?
-d3_selectionPrototype.insert = function(name, before) {
-  name = d3.ns.qualify(name);
-
-  function insert() {
-    return this.insertBefore(
-        document.createElementNS(this.namespaceURI, name),
-        d3_select(before, this));
-  }
-
-  function insertNS() {
-    return this.insertBefore(
-        document.createElementNS(name.space, name.local),
-        d3_select(before, this));
-  }
-
-  return this.select(name.local ? insertNS : insert);
-};
-// TODO remove(selector)?
-// TODO remove(node)?
-// TODO remove(function)?
-d3_selectionPrototype.remove = function() {
-  return this.each(function() {
-    var parent = this.parentNode;
-    if (parent) parent.removeChild(this);
-  });
-};
-d3_selectionPrototype.data = function(value, key) {
-  var i = -1,
-      n = this.length,
-      group,
-      node;
-
-  // If no value is specified, return the first value.
-  if (!arguments.length) {
-    value = new Array(n = (group = this[0]).length);
-    while (++i < n) {
-      if (node = group[i]) {
-        value[i] = node.__data__;
-      }
-    }
-    return value;
-  }
-
-  function bind(group, groupData) {
-    var i,
-        n = group.length,
-        m = groupData.length,
-        n0 = Math.min(n, m),
-        n1 = Math.max(n, m),
-        updateNodes = [],
-        enterNodes = [],
-        exitNodes = [],
-        node,
-        nodeData;
-
-    if (key) {
-      var nodeByKeyValue = new d3_Map,
-          keyValues = [],
-          keyValue,
-          j = groupData.length;
-
-      for (i = -1; ++i < n;) {
-        keyValue = key.call(node = group[i], node.__data__, i);
-        if (nodeByKeyValue.has(keyValue)) {
-          exitNodes[j++] = node; // duplicate key
-        } else {
-          nodeByKeyValue.set(keyValue, node);
-        }
-        keyValues.push(keyValue);
-      }
-
-      for (i = -1; ++i < m;) {
-        keyValue = key.call(groupData, nodeData = groupData[i], i)
-        if (nodeByKeyValue.has(keyValue)) {
-          updateNodes[i] = node = nodeByKeyValue.get(keyValue);
-          node.__data__ = nodeData;
-          enterNodes[i] = exitNodes[i] = null;
-        } else {
-          enterNodes[i] = d3_selection_dataNode(nodeData);
-          updateNodes[i] = exitNodes[i] = null;
-        }
-        nodeByKeyValue.remove(keyValue);
-      }
-
-      for (i = -1; ++i < n;) {
-        if (nodeByKeyValue.has(keyValues[i])) {
-          exitNodes[i] = group[i];
-        }
-      }
-    } else {
-      for (i = -1; ++i < n0;) {
-        node = group[i];
-        nodeData = groupData[i];
-        if (node) {
-          node.__data__ = nodeData;
-          updateNodes[i] = node;
-          enterNodes[i] = exitNodes[i] = null;
-        } else {
-          enterNodes[i] = d3_selection_dataNode(nodeData);
-          updateNodes[i] = exitNodes[i] = null;
-        }
-      }
-      for (; i < m; ++i) {
-        enterNodes[i] = d3_selection_dataNode(groupData[i]);
-        updateNodes[i] = exitNodes[i] = null;
-      }
-      for (; i < n1; ++i) {
-        exitNodes[i] = group[i];
-        enterNodes[i] = updateNodes[i] = null;
-      }
-    }
-
-    enterNodes.update
-        = updateNodes;
-
-    enterNodes.parentNode
-        = updateNodes.parentNode
-        = exitNodes.parentNode
-        = group.parentNode;
-
-    enter.push(enterNodes);
-    update.push(updateNodes);
-    exit.push(exitNodes);
-  }
-
-  var enter = d3_selection_enter([]),
-      update = d3_selection([]),
-      exit = d3_selection([]);
-
-  if (typeof value === "function") {
-    while (++i < n) {
-      bind(group = this[i], value.call(group, group.parentNode.__data__, i));
-    }
-  } else {
-    while (++i < n) {
-      bind(group = this[i], value);
-    }
-  }
-
-  update.enter = function() { return enter; };
-  update.exit = function() { return exit; };
-  return update;
-};
-
-function d3_selection_dataNode(data) {
-  return {__data__: data};
-}
-d3_selectionPrototype.datum =
-d3_selectionPrototype.map = function(value) {
-  return arguments.length < 1
-      ? this.property("__data__")
-      : this.property("__data__", value);
-};
-d3_selectionPrototype.filter = function(filter) {
-  var subgroups = [],
-      subgroup,
-      group,
-      node;
-
-  if (typeof filter !== "function") filter = d3_selection_filter(filter);
-
-  for (var j = 0, m = this.length; j < m; j++) {
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = (group = this[j]).parentNode;
-    for (var i = 0, n = group.length; i < n; i++) {
-      if ((node = group[i]) && filter.call(node, node.__data__, i)) {
-        subgroup.push(node);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-
-function d3_selection_filter(selector) {
-  return function() {
-    return d3_selectMatches(this, selector);
-  };
-}
-d3_selectionPrototype.order = function() {
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
-      if (node = group[i]) {
-        if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
-        next = node;
-      }
-    }
-  }
-  return this;
-};
-d3_selectionPrototype.sort = function(comparator) {
-  comparator = d3_selection_sortComparator.apply(this, arguments);
-  for (var j = -1, m = this.length; ++j < m;) this[j].sort(comparator);
-  return this.order();
-};
-
-function d3_selection_sortComparator(comparator) {
-  if (!arguments.length) comparator = d3.ascending;
-  return function(a, b) {
-    return comparator(a && a.__data__, b && b.__data__);
-  };
-}
-// type can be namespaced, e.g., "click.foo"
-// listener can be null for removal
-d3_selectionPrototype.on = function(type, listener, capture) {
-  if (arguments.length < 3) capture = false;
-
-  // parse the type specifier
-  var name = "__on" + type, i = type.indexOf(".");
-  if (i > 0) type = type.substring(0, i);
-
-  // if called with only one argument, return the current listener
-  if (arguments.length < 2) return (i = this.node()[name]) && i._;
-
-  // remove the old event listener, and add the new event listener
-  return this.each(function(d, i) {
-    var node = this,
-        o = node[name];
-
-    // remove the old listener, if any (using the previously-set capture)
-    if (o) {
-      node.removeEventListener(type, o, o.$);
-      delete node[name];
-    }
-
-    // add the new listener, if any (remembering the capture flag)
-    if (listener) {
-      node.addEventListener(type, node[name] = l, l.$ = capture);
-      l._ = listener; // stash the unwrapped listener for get
-    }
-
-    // wrapped event listener that preserves i
-    function l(e) {
-      var o = d3.event; // Events can be reentrant (e.g., focus).
-      d3.event = e;
-      try {
-        listener.call(node, node.__data__, i);
-      } finally {
-        d3.event = o;
-      }
-    }
-  });
-};
-d3_selectionPrototype.each = function(callback) {
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      var node = group[i];
-      if (node) callback.call(node, node.__data__, i, j);
-    }
-  }
-  return this;
-};
-//
-// Note: assigning to the arguments array simultaneously changes the value of
-// the corresponding argument!
-//
-// TODO The `this` argument probably shouldn't be the first argument to the
-// callback, anyway, since it's redundant. However, that will require a major
-// version bump due to backwards compatibility, so I'm not changing it right
-// away.
-//
-d3_selectionPrototype.call = function(callback) {
-  callback.apply(this, (arguments[0] = this, arguments));
-  return this;
-};
-d3_selectionPrototype.empty = function() {
-  return !this.node();
-};
-d3_selectionPrototype.node = function(callback) {
-  for (var j = 0, m = this.length; j < m; j++) {
-    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
-      var node = group[i];
-      if (node) return node;
-    }
-  }
-  return null;
-};
-d3_selectionPrototype.transition = function() {
-  var subgroups = [],
-      subgroup,
-      node;
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      subgroup.push((node = group[i]) ? {node: node, delay: d3_transitionDelay, duration: d3_transitionDuration} : null);
-    }
-  }
-
-  return d3_transition(subgroups, d3_transitionId || ++d3_transitionNextId, Date.now());
-};
-var d3_selectionRoot = d3_selection([[document]]);
-
-d3_selectionRoot[0].parentNode = d3_selectRoot;
-
-// TODO fast singleton implementation!
-// TODO select(function)
-d3.select = function(selector) {
-  return typeof selector === "string"
-      ? d3_selectionRoot.select(selector)
-      : d3_selection([[selector]]); // assume node
-};
-
-// TODO selectAll(function)
-d3.selectAll = function(selector) {
-  return typeof selector === "string"
-      ? d3_selectionRoot.selectAll(selector)
-      : d3_selection([d3_array(selector)]); // assume node[]
-};
-function d3_selection_enter(selection) {
-  d3_arraySubclass(selection, d3_selection_enterPrototype);
-  return selection;
-}
-
-var d3_selection_enterPrototype = [];
-
-d3.selection.enter = d3_selection_enter;
-d3.selection.enter.prototype = d3_selection_enterPrototype;
-
-d3_selection_enterPrototype.append = d3_selectionPrototype.append;
-d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;
-d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
-d3_selection_enterPrototype.node = d3_selectionPrototype.node;
-d3_selection_enterPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      upgroup,
-      group,
-      node;
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    upgroup = (group = this[j]).update;
-    subgroups.push(subgroup = []);
-    subgroup.parentNode = group.parentNode;
-    for (var i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i));
-        subnode.__data__ = node.__data__;
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_selection(subgroups);
-};
-function d3_transition(groups, id, time) {
-  d3_arraySubclass(groups, d3_transitionPrototype);
-
-  var tweens = new d3_Map,
-      event = d3.dispatch("start", "end"),
-      ease = d3_transitionEase;
-
-  groups.id = id;
-
-  groups.time = time;
-
-  groups.tween = function(name, tween) {
-    if (arguments.length < 2) return tweens.get(name);
-    if (tween == null) tweens.remove(name);
-    else tweens.set(name, tween);
-    return groups;
-  };
-
-  groups.ease = function(value) {
-    if (!arguments.length) return ease;
-    ease = typeof value === "function" ? value : d3.ease.apply(d3, arguments);
-    return groups;
-  };
-
-  groups.each = function(type, listener) {
-    if (arguments.length < 2) return d3_transition_each.call(groups, type);
-    event.on(type, listener);
-    return groups;
-  };
-
-  d3.timer(function(elapsed) {
-    groups.each(function(d, i, j) {
-      var tweened = [],
-          node = this,
-          delay = groups[j][i].delay,
-          duration = groups[j][i].duration,
-          lock = node.__transition__ || (node.__transition__ = {active: 0, count: 0});
-
-      ++lock.count;
-
-      delay <= elapsed ? start(elapsed) : d3.timer(start, delay, time);
-
-      function start(elapsed) {
-        if (lock.active > id) return stop();
-        lock.active = id;
-
-        tweens.forEach(function(key, value) {
-          if (tween = value.call(node, d, i)) {
-            tweened.push(tween);
-          }
-        });
-
-        event.start.call(node, d, i);
-        if (!tick(elapsed)) d3.timer(tick, 0, time);
-        return 1;
-      }
-
-      function tick(elapsed) {
-        if (lock.active !== id) return stop();
-
-        var t = (elapsed - delay) / duration,
-            e = ease(t),
-            n = tweened.length;
-
-        while (n > 0) {
-          tweened[--n].call(node, e);
-        }
-
-        if (t >= 1) {
-          stop();
-          d3_transitionId = id;
-          event.end.call(node, d, i);
-          d3_transitionId = 0;
-          return 1;
-        }
-      }
-
-      function stop() {
-        if (!--lock.count) delete node.__transition__;
-        return 1;
-      }
-    });
-    return 1;
-  }, 0, time);
-
-  return groups;
-}
-
-var d3_transitionRemove = {};
-
-function d3_transitionNull(d, i, a) {
-  return a != "" && d3_transitionRemove;
-}
-
-function d3_transitionTween(name, b) {
-  var interpolate = d3_interpolateByName(name);
-
-  function transitionFunction(d, i, a) {
-    var v = b.call(this, d, i);
-    return v == null
-        ? a != "" && d3_transitionRemove
-        : a != v && interpolate(a, v);
-  }
-
-  function transitionString(d, i, a) {
-    return a != b && interpolate(a, b);
-  }
-
-  return typeof b === "function" ? transitionFunction
-      : b == null ? d3_transitionNull
-      : (b += "", transitionString);
-}
-
-var d3_transitionPrototype = [],
-    d3_transitionNextId = 0,
-    d3_transitionId = 0,
-    d3_transitionDefaultDelay = 0,
-    d3_transitionDefaultDuration = 250,
-    d3_transitionDefaultEase = d3.ease("cubic-in-out"),
-    d3_transitionDelay = d3_transitionDefaultDelay,
-    d3_transitionDuration = d3_transitionDefaultDuration,
-    d3_transitionEase = d3_transitionDefaultEase;
-
-d3_transitionPrototype.call = d3_selectionPrototype.call;
-
-d3.transition = function(selection) {
-  return arguments.length
-      ? (d3_transitionId ? selection.transition() : selection)
-      : d3_selectionRoot.transition();
-};
-
-d3.transition.prototype = d3_transitionPrototype;
-d3_transitionPrototype.select = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnode,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selector(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    subgroups.push(subgroup = []);
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if ((node = group[i]) && (subnode = selector.call(node.node, node.node.__data__, i))) {
-        if ("__data__" in node.node) subnode.__data__ = node.node.__data__;
-        subgroup.push({node: subnode, delay: node.delay, duration: node.duration});
-      } else {
-        subgroup.push(null);
-      }
-    }
-  }
-
-  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
-};
-d3_transitionPrototype.selectAll = function(selector) {
-  var subgroups = [],
-      subgroup,
-      subnodes,
-      node;
-
-  if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
-
-  for (var j = -1, m = this.length; ++j < m;) {
-    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
-      if (node = group[i]) {
-        subnodes = selector.call(node.node, node.node.__data__, i);
-        subgroups.push(subgroup = []);
-        for (var k = -1, o = subnodes.length; ++k < o;) {
-          subgroup.push({node: subnodes[k], delay: node.delay, duration: node.duration});
-        }
-      }
-    }
-  }
-
-  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
-};
-d3_transitionPrototype.attr = function(name, value) {
-  return this.attrTween(name, d3_transitionTween(name, value));
-};
-
-d3_transitionPrototype.attrTween = function(nameNS, tween) {
-  var name = d3.ns.qualify(nameNS);
-
-  function attrTween(d, i) {
-    var f = tween.call(this, d, i, this.getAttribute(name));
-    return f === d3_transitionRemove
-        ? (this.removeAttribute(name), null)
-        : f && function(t) { this.setAttribute(name, f(t)); };
-  }
-
-  function attrTweenNS(d, i) {
-    var f = tween.call(this, d, i, this.getAttributeNS(name.space, name.local));
-    return f === d3_transitionRemove
-        ? (this.removeAttributeNS(name.space, name.local), null)
-        : f && function(t) { this.setAttributeNS(name.space, name.local, f(t)); };
-  }
-
-  return this.tween("attr." + nameNS, name.local ? attrTweenNS : attrTween);
-};
-d3_transitionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = "";
-  return this.styleTween(name, d3_transitionTween(name, value), priority);
-};
-
-d3_transitionPrototype.styleTween = function(name, tween, priority) {
-  if (arguments.length < 3) priority = "";
-  return this.tween("style." + name, function(d, i) {
-    var f = tween.call(this, d, i, window.getComputedStyle(this, null).getPropertyValue(name));
-    return f === d3_transitionRemove
-        ? (this.style.removeProperty(name), null)
-        : f && function(t) { this.style.setProperty(name, f(t), priority); };
-  });
-};
-d3_transitionPrototype.text = function(value) {
-  return this.tween("text", function(d, i) {
-    this.textContent = typeof value === "function"
-        ? value.call(this, d, i)
-        : value;
-  });
-};
-d3_transitionPrototype.remove = function() {
-  return this.each("end.transition", function() {
-    var p;
-    if (!this.__transition__ && (p = this.parentNode)) p.removeChild(this);
-  });
-};
-d3_transitionPrototype.delay = function(value) {
-  var groups = this;
-  return groups.each(typeof value === "function"
-      ? function(d, i, j) { groups[j][i].delay = value.apply(this, arguments) | 0; }
-      : (value = value | 0, function(d, i, j) { groups[j][i].delay = value; }));
-};
-d3_transitionPrototype.duration = function(value) {
-  var groups = this;
-  return groups.each(typeof value === "function"
-      ? function(d, i, j) { groups[j][i].duration = Math.max(1, value.apply(this, arguments) | 0); }
-      : (value = Math.max(1, value | 0), function(d, i, j) { groups[j][i].duration = value; }));
-};
-function d3_transition_each(callback) {
-  var id = d3_transitionId,
-      ease = d3_transitionEase,
-      delay = d3_transitionDelay,
-      duration = d3_transitionDuration;
-
-  d3_transitionId = this.id;
-  d3_transitionEase = this.ease();
-  for (var j = 0, m = this.length; j < m; j++) {
-    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
-      var node = group[i];
-      if (node) {
-        d3_transitionDelay = this[j][i].delay;
-        d3_transitionDuration = this[j][i].duration;
-        callback.call(node = node.node, node.__data__, i, j);
-      }
-    }
-  }
-
-  d3_transitionId = id;
-  d3_transitionEase = ease;
-  d3_transitionDelay = delay;
-  d3_transitionDuration = duration;
-  return this;
-}
-d3_transitionPrototype.transition = function() {
-  return this.select(d3_this);
-};
-var d3_timer_queue = null,
-    d3_timer_interval, // is an interval (or frame) active?
-    d3_timer_timeout; // is a timeout active?
-
-// The timer will continue to fire until callback returns true.
-d3.timer = function(callback, delay, then) {
-  var found = false,
-      t0,
-      t1 = d3_timer_queue;
-
-  if (arguments.length < 3) {
-    if (arguments.length < 2) delay = 0;
-    else if (!isFinite(delay)) return;
-    then = Date.now();
-  }
-
-  // See if the callback's already in the queue.
-  while (t1) {
-    if (t1.callback === callback) {
-      t1.then = then;
-      t1.delay = delay;
-      found = true;
-      break;
-    }
-    t0 = t1;
-    t1 = t1.next;
-  }
-
-  // Otherwise, add the callback to the queue.
-  if (!found) d3_timer_queue = {
-    callback: callback,
-    then: then,
-    delay: delay,
-    next: d3_timer_queue
-  };
-
-  // Start animatin'!
-  if (!d3_timer_interval) {
-    d3_timer_timeout = clearTimeout(d3_timer_timeout);
-    d3_timer_interval = 1;
-    d3_timer_frame(d3_timer_step);
-  }
-}
-
-function d3_timer_step() {
-  var elapsed,
-      now = Date.now(),
-      t1 = d3_timer_queue;
-
-  while (t1) {
-    elapsed = now - t1.then;
-    if (elapsed >= t1.delay) t1.flush = t1.callback(elapsed);
-    t1 = t1.next;
-  }
-
-  var delay = d3_timer_flush() - now;
-  if (delay > 24) {
-    if (isFinite(delay)) {
-      clearTimeout(d3_timer_timeout);
-      d3_timer_timeout = setTimeout(d3_timer_step, delay);
-    }
-    d3_timer_interval = 0;
-  } else {
-    d3_timer_interval = 1;
-    d3_timer_frame(d3_timer_step);
-  }
-}
-
-d3.timer.flush = function() {
-  var elapsed,
-      now = Date.now(),
-      t1 = d3_timer_queue;
-
-  while (t1) {
-    elapsed = now - t1.then;
-    if (!t1.delay) t1.flush = t1.callback(elapsed);
-    t1 = t1.next;
-  }
-
-  d3_timer_flush();
-};
-
-// Flush after callbacks, to avoid concurrent queue modification.
-function d3_timer_flush() {
-  var t0 = null,
-      t1 = d3_timer_queue,
-      then = Infinity;
-  while (t1) {
-    if (t1.flush) {
-      t1 = t0 ? t0.next = t1.next : d3_timer_queue = t1.next;
-    } else {
-      then = Math.min(then, t1.then + t1.delay);
-      t1 = (t0 = t1).next;
-    }
-  }
-  return then;
-}
-
-var d3_timer_frame = window.requestAnimationFrame
-    || window.webkitRequestAnimationFrame
-    || window.mozRequestAnimationFrame
-    || window.oRequestAnimationFrame
-    || window.msRequestAnimationFrame
-    || function(callback) { setTimeout(callback, 17); };
-d3.transform = function(string) {
-  var g = document.createElementNS(d3.ns.prefix.svg, "g"),
-      identity = {a: 1, b: 0, c: 0, d: 1, e: 0, f: 0};
-  return (d3.transform = function(string) {
-    g.setAttribute("transform", string);
-    var t = g.transform.baseVal.consolidate();
-    return new d3_transform(t ? t.matrix : identity);
-  })(string);
-};
-
-// Compute x-scale and normalize the first row.
-// Compute shear and make second row orthogonal to first.
-// Compute y-scale and normalize the second row.
-// Finally, compute the rotation.
-function d3_transform(m) {
-  var r0 = [m.a, m.b],
-      r1 = [m.c, m.d],
-      kx = d3_transformNormalize(r0),
-      kz = d3_transformDot(r0, r1),
-      ky = d3_transformNormalize(d3_transformCombine(r1, r0, -kz)) || 0;
-  if (r0[0] * r1[1] < r1[0] * r0[1]) {
-    r0[0] *= -1;
-    r0[1] *= -1;
-    kx *= -1;
-    kz *= -1;
-  }
-  this.rotate = (kx ? Math.atan2(r0[1], r0[0]) : Math.atan2(-r1[0], r1[1])) * d3_transformDegrees;
-  this.translate = [m.e, m.f];
-  this.scale = [kx, ky];
-  this.skew = ky ? Math.atan2(kz, ky) * d3_transformDegrees : 0;
-};
-
-d3_transform.prototype.toString = function() {
-  return "translate(" + this.translate
-      + ")rotate(" + this.rotate
-      + ")skewX(" + this.skew
-      + ")scale(" + this.scale
-      + ")";
-};
-
-function d3_transformDot(a, b) {
-  return a[0] * b[0] + a[1] * b[1];
-}
-
-function d3_transformNormalize(a) {
-  var k = Math.sqrt(d3_transformDot(a, a));
-  if (k) {
-    a[0] /= k;
-    a[1] /= k;
-  }
-  return k;
-}
-
-function d3_transformCombine(a, b, k) {
-  a[0] += k * b[0];
-  a[1] += k * b[1];
-  return a;
-}
-
-var d3_transformDegrees = 180 / Math.PI;
-d3.mouse = function(container) {
-  return d3_mousePoint(container, d3_eventSource());
-};
-
-// https://bugs.webkit.org/show_bug.cgi?id=44083
-var d3_mouse_bug44083 = /WebKit/.test(navigator.userAgent) ? -1 : 0;
-
-function d3_mousePoint(container, e) {
-  var svg = container.ownerSVGElement || container;
-  if (svg.createSVGPoint) {
-    var point = svg.createSVGPoint();
-    if ((d3_mouse_bug44083 < 0) && (window.scrollX || window.scrollY)) {
-      svg = d3.select(document.body)
-        .append("svg")
-          .style("position", "absolute")
-          .style("top", 0)
-          .style("left", 0);
-      var ctm = svg[0][0].getScreenCTM();
-      d3_mouse_bug44083 = !(ctm.f || ctm.e);
-      svg.remove();
-    }
-    if (d3_mouse_bug44083) {
-      point.x = e.pageX;
-      point.y = e.pageY;
-    } else {
-      point.x = e.clientX;
-      point.y = e.clientY;
-    }
-    point = point.matrixTransform(container.getScreenCTM().inverse());
-    return [point.x, point.y];
-  }
-  var rect = container.getBoundingClientRect();
-  return [e.clientX - rect.left - container.clientLeft, e.clientY - rect.top - container.clientTop];
-};
-d3.touches = function(container, touches) {
-  if (arguments.length < 2) touches = d3_eventSource().touches;
-  return touches ? d3_array(touches).map(function(touch) {
-    var point = d3_mousePoint(container, touch);
-    point.identifier = touch.identifier;
-    return point;
-  }) : [];
-};
-function d3_noop() {}
-d3.scale = {};
-
-function d3_scaleExtent(domain) {
-  var start = domain[0], stop = domain[domain.length - 1];
-  return start < stop ? [start, stop] : [stop, start];
-}
-
-function d3_scaleRange(scale) {
-  return scale.rangeExtent ? scale.rangeExtent() : d3_scaleExtent(scale.range());
-}
-function d3_scale_nice(domain, nice) {
-  var i0 = 0,
-      i1 = domain.length - 1,
-      x0 = domain[i0],
-      x1 = domain[i1],
-      dx;
-
-  if (x1 < x0) {
-    dx = i0; i0 = i1; i1 = dx;
-    dx = x0; x0 = x1; x1 = dx;
-  }
-
-  if (dx = x1 - x0) {
-    nice = nice(dx);
-    domain[i0] = nice.floor(x0);
-    domain[i1] = nice.ceil(x1);
-  }
-
-  return domain;
-}
-
-function d3_scale_niceDefault() {
-  return Math;
-}
-d3.scale.linear = function() {
-  return d3_scale_linear([0, 1], [0, 1], d3.interpolate, false);
-};
-
-function d3_scale_linear(domain, range, interpolate, clamp) {
-  var output,
-      input;
-
-  function rescale() {
-    var linear = Math.min(domain.length, range.length) > 2 ? d3_scale_polylinear : d3_scale_bilinear,
-        uninterpolate = clamp ? d3_uninterpolateClamp : d3_uninterpolateNumber;
-    output = linear(domain, range, uninterpolate, interpolate);
-    input = linear(range, domain, uninterpolate, d3.interpolate);
-    return scale;
-  }
-
-  function scale(x) {
-    return output(x);
-  }
-
-  // Note: requires range is coercible to number!
-  scale.invert = function(y) {
-    return input(y);
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = x.map(Number);
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.rangeRound = function(x) {
-    return scale.range(x).interpolate(d3.interpolateRound);
-  };
-
-  scale.clamp = function(x) {
-    if (!arguments.length) return clamp;
-    clamp = x;
-    return rescale();
-  };
-
-  scale.interpolate = function(x) {
-    if (!arguments.length) return interpolate;
-    interpolate = x;
-    return rescale();
-  };
-
-  scale.ticks = function(m) {
-    return d3_scale_linearTicks(domain, m);
-  };
-
-  scale.tickFormat = function(m) {
-    return d3_scale_linearTickFormat(domain, m);
-  };
-
-  scale.nice = function() {
-    d3_scale_nice(domain, d3_scale_linearNice);
-    return rescale();
-  };
-
-  scale.copy = function() {
-    return d3_scale_linear(domain, range, interpolate, clamp);
-  };
-
-  return rescale();
-}
-
-function d3_scale_linearRebind(scale, linear) {
-  return d3.rebind(scale, linear, "range", "rangeRound", "interpolate", "clamp");
-}
-
-function d3_scale_linearNice(dx) {
-  dx = Math.pow(10, Math.round(Math.log(dx) / Math.LN10) - 1);
-  return {
-    floor: function(x) { return Math.floor(x / dx) * dx; },
-    ceil: function(x) { return Math.ceil(x / dx) * dx; }
-  };
-}
-
-function d3_scale_linearTickRange(domain, m) {
-  var extent = d3_scaleExtent(domain),
-      span = extent[1] - extent[0],
-      step = Math.pow(10, Math.floor(Math.log(span / m) / Math.LN10)),
-      err = m / span * step;
-
-  // Filter ticks to get closer to the desired count.
-  if (err <= .15) step *= 10;
-  else if (err <= .35) step *= 5;
-  else if (err <= .75) step *= 2;
-
-  // Round start and stop values to step interval.
-  extent[0] = Math.ceil(extent[0] / step) * step;
-  extent[1] = Math.floor(extent[1] / step) * step + step * .5; // inclusive
-  extent[2] = step;
-  return extent;
-}
-
-function d3_scale_linearTicks(domain, m) {
-  return d3.range.apply(d3, d3_scale_linearTickRange(domain, m));
-}
-
-function d3_scale_linearTickFormat(domain, m) {
-  return d3.format(",." + Math.max(0, -Math.floor(Math.log(d3_scale_linearTickRange(domain, m)[2]) / Math.LN10 + .01)) + "f");
-}
-function d3_scale_bilinear(domain, range, uninterpolate, interpolate) {
-  var u = uninterpolate(domain[0], domain[1]),
-      i = interpolate(range[0], range[1]);
-  return function(x) {
-    return i(u(x));
-  };
-}
-function d3_scale_polylinear(domain, range, uninterpolate, interpolate) {
-  var u = [],
-      i = [],
-      j = 0,
-      k = Math.min(domain.length, range.length) - 1;
-
-  // Handle descending domains.
-  if (domain[k] < domain[0]) {
-    domain = domain.slice().reverse();
-    range = range.slice().reverse();
-  }
-
-  while (++j <= k) {
-    u.push(uninterpolate(domain[j - 1], domain[j]));
-    i.push(interpolate(range[j - 1], range[j]));
-  }
-
-  return function(x) {
-    var j = d3.bisect(domain, x, 1, k) - 1;
-    return i[j](u[j](x));
-  };
-}
-d3.scale.log = function() {
-  return d3_scale_log(d3.scale.linear(), d3_scale_logp);
-};
-
-function d3_scale_log(linear, log) {
-  var pow = log.pow;
-
-  function scale(x) {
-    return linear(log(x));
-  }
-
-  scale.invert = function(x) {
-    return pow(linear.invert(x));
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return linear.domain().map(pow);
-    log = x[0] < 0 ? d3_scale_logn : d3_scale_logp;
-    pow = log.pow;
-    linear.domain(x.map(log));
-    return scale;
-  };
-
-  scale.nice = function() {
-    linear.domain(d3_scale_nice(linear.domain(), d3_scale_niceDefault));
-    return scale;
-  };
-
-  scale.ticks = function() {
-    var extent = d3_scaleExtent(linear.domain()),
-        ticks = [];
-    if (extent.every(isFinite)) {
-      var i = Math.floor(extent[0]),
-          j = Math.ceil(extent[1]),
-          u = pow(extent[0]),
-          v = pow(extent[1]);
-      if (log === d3_scale_logn) {
-        ticks.push(pow(i));
-        for (; i++ < j;) for (var k = 9; k > 0; k--) ticks.push(pow(i) * k);
-      } else {
-        for (; i < j; i++) for (var k = 1; k < 10; k++) ticks.push(pow(i) * k);
-        ticks.push(pow(i));
-      }
-      for (i = 0; ticks[i] < u; i++) {} // strip small values
-      for (j = ticks.length; ticks[j - 1] > v; j--) {} // strip big values
-      ticks = ticks.slice(i, j);
-    }
-    return ticks;
-  };
-
-  scale.tickFormat = function(n, format) {
-    if (arguments.length < 2) format = d3_scale_logFormat;
-    if (arguments.length < 1) return format;
-    var k = n / scale.ticks().length,
-        f = log === d3_scale_logn ? (e = -1e-12, Math.floor) : (e = 1e-12, Math.ceil),
-        e;
-    return function(d) {
-      return d / pow(f(log(d) + e)) < k ? format(d) : "";
-    };
-  };
-
-  scale.copy = function() {
-    return d3_scale_log(linear.copy(), log);
-  };
-
-  return d3_scale_linearRebind(scale, linear);
-}
-
-var d3_scale_logFormat = d3.format(".0e");
-
-function d3_scale_logp(x) {
-  return Math.log(x < 0 ? 0 : x) / Math.LN10;
-}
-
-function d3_scale_logn(x) {
-  return -Math.log(x > 0 ? 0 : -x) / Math.LN10;
-}
-
-d3_scale_logp.pow = function(x) {
-  return Math.pow(10, x);
-};
-
-d3_scale_logn.pow = function(x) {
-  return -Math.pow(10, -x);
-};
-d3.scale.pow = function() {
-  return d3_scale_pow(d3.scale.linear(), 1);
-};
-
-function d3_scale_pow(linear, exponent) {
-  var powp = d3_scale_powPow(exponent),
-      powb = d3_scale_powPow(1 / exponent);
-
-  function scale(x) {
-    return linear(powp(x));
-  }
-
-  scale.invert = function(x) {
-    return powb(linear.invert(x));
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return linear.domain().map(powb);
-    linear.domain(x.map(powp));
-    return scale;
-  };
-
-  scale.ticks = function(m) {
-    return d3_scale_linearTicks(scale.domain(), m);
-  };
-
-  scale.tickFormat = function(m) {
-    return d3_scale_linearTickFormat(scale.domain(), m);
-  };
-
-  scale.nice = function() {
-    return scale.domain(d3_scale_nice(scale.domain(), d3_scale_linearNice));
-  };
-
-  scale.exponent = function(x) {
-    if (!arguments.length) return exponent;
-    var domain = scale.domain();
-    powp = d3_scale_powPow(exponent = x);
-    powb = d3_scale_powPow(1 / exponent);
-    return scale.domain(domain);
-  };
-
-  scale.copy = function() {
-    return d3_scale_pow(linear.copy(), exponent);
-  };
-
-  return d3_scale_linearRebind(scale, linear);
-}
-
-function d3_scale_powPow(e) {
-  return function(x) {
-    return x < 0 ? -Math.pow(-x, e) : Math.pow(x, e);
-  };
-}
-d3.scale.sqrt = function() {
-  return d3.scale.pow().exponent(.5);
-};
-d3.scale.ordinal = function() {
-  return d3_scale_ordinal([], {t: "range", x: []});
-};
-
-function d3_scale_ordinal(domain, ranger) {
-  var index,
-      range,
-      rangeBand;
-
-  function scale(x) {
-    return range[((index.get(x) || index.set(x, domain.push(x))) - 1) % range.length];
-  }
-
-  function steps(start, step) {
-    return d3.range(domain.length).map(function(i) { return start + step * i; });
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = [];
-    index = new d3_Map;
-    var i = -1, n = x.length, xi;
-    while (++i < n) if (!index.has(xi = x[i])) index.set(xi, domain.push(xi));
-    return scale[ranger.t](ranger.x, ranger.p);
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    rangeBand = 0;
-    ranger = {t: "range", x: x};
-    return scale;
-  };
-
-  scale.rangePoints = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var start = x[0],
-        stop = x[1],
-        step = (stop - start) / (domain.length - 1 + padding);
-    range = steps(domain.length < 2 ? (start + stop) / 2 : start + step * padding / 2, step);
-    rangeBand = 0;
-    ranger = {t: "rangePoints", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeBands = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var reverse = x[1] < x[0],
-        start = x[reverse - 0],
-        stop = x[1 - reverse],
-        step = (stop - start) / (domain.length + padding);
-    range = steps(start + step * padding, step);
-    if (reverse) range.reverse();
-    rangeBand = step * (1 - padding);
-    ranger = {t: "rangeBands", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeRoundBands = function(x, padding) {
-    if (arguments.length < 2) padding = 0;
-    var reverse = x[1] < x[0],
-        start = x[reverse - 0],
-        stop = x[1 - reverse],
-        step = Math.floor((stop - start) / (domain.length + padding)),
-        error = stop - start - (domain.length - padding) * step;
-    range = steps(start + Math.round(error / 2), step);
-    if (reverse) range.reverse();
-    rangeBand = Math.round(step * (1 - padding));
-    ranger = {t: "rangeRoundBands", x: x, p: padding};
-    return scale;
-  };
-
-  scale.rangeBand = function() {
-    return rangeBand;
-  };
-
-  scale.rangeExtent = function() {
-    return d3_scaleExtent(ranger.x);
-  };
-
-  scale.copy = function() {
-    return d3_scale_ordinal(domain, ranger);
-  };
-
-  return scale.domain(domain);
-}
-/*
- * This product includes color specifications and designs developed by Cynthia
- * Brewer (http://colorbrewer.org/). See lib/colorbrewer for more information.
- */
-
-d3.scale.category10 = function() {
-  return d3.scale.ordinal().range(d3_category10);
-};
-
-d3.scale.category20 = function() {
-  return d3.scale.ordinal().range(d3_category20);
-};
-
-d3.scale.category20b = function() {
-  return d3.scale.ordinal().range(d3_category20b);
-};
-
-d3.scale.category20c = function() {
-  return d3.scale.ordinal().range(d3_category20c);
-};
-
-var d3_category10 = [
-  "#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd",
-  "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"
-];
-
-var d3_category20 = [
-  "#1f77b4", "#aec7e8",
-  "#ff7f0e", "#ffbb78",
-  "#2ca02c", "#98df8a",
-  "#d62728", "#ff9896",
-  "#9467bd", "#c5b0d5",
-  "#8c564b", "#c49c94",
-  "#e377c2", "#f7b6d2",
-  "#7f7f7f", "#c7c7c7",
-  "#bcbd22", "#dbdb8d",
-  "#17becf", "#9edae5"
-];
-
-var d3_category20b = [
-  "#393b79", "#5254a3", "#6b6ecf", "#9c9ede",
-  "#637939", "#8ca252", "#b5cf6b", "#cedb9c",
-  "#8c6d31", "#bd9e39", "#e7ba52", "#e7cb94",
-  "#843c39", "#ad494a", "#d6616b", "#e7969c",
-  "#7b4173", "#a55194", "#ce6dbd", "#de9ed6"
-];
-
-var d3_category20c = [
-  "#3182bd", "#6baed6", "#9ecae1", "#c6dbef",
-  "#e6550d", "#fd8d3c", "#fdae6b", "#fdd0a2",
-  "#31a354", "#74c476", "#a1d99b", "#c7e9c0",
-  "#756bb1", "#9e9ac8", "#bcbddc", "#dadaeb",
-  "#636363", "#969696", "#bdbdbd", "#d9d9d9"
-];
-d3.scale.quantile = function() {
-  return d3_scale_quantile([], []);
-};
-
-function d3_scale_quantile(domain, range) {
-  var thresholds;
-
-  function rescale() {
-    var k = 0,
-        n = domain.length,
-        q = range.length;
-    thresholds = [];
-    while (++k < q) thresholds[k - 1] = d3.quantile(domain, k / q);
-    return scale;
-  }
-
-  function scale(x) {
-    if (isNaN(x = +x)) return NaN;
-    return range[d3.bisect(thresholds, x)];
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return domain;
-    domain = x.filter(function(d) { return !isNaN(d); }).sort(d3.ascending);
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.quantiles = function() {
-    return thresholds;
-  };
-
-  scale.copy = function() {
-    return d3_scale_quantile(domain, range); // copy on write!
-  };
-
-  return rescale();
-}
-d3.scale.quantize = function() {
-  return d3_scale_quantize(0, 1, [0, 1]);
-};
-
-function d3_scale_quantize(x0, x1, range) {
-  var kx, i;
-
-  function scale(x) {
-    return range[Math.max(0, Math.min(i, Math.floor(kx * (x - x0))))];
-  }
-
-  function rescale() {
-    kx = range.length / (x1 - x0);
-    i = range.length - 1;
-    return scale;
-  }
-
-  scale.domain = function(x) {
-    if (!arguments.length) return [x0, x1];
-    x0 = +x[0];
-    x1 = +x[x.length - 1];
-    return rescale();
-  };
-
-  scale.range = function(x) {
-    if (!arguments.length) return range;
-    range = x;
-    return rescale();
-  };
-
-  scale.copy = function() {
-    return d3_scale_quantize(x0, x1, range); // copy on write
-  };
-
-  return rescale();
-}
-d3.scale.identity = function() {
-  return d3_scale_identity([0, 1]);
-};
-
-function d3_scale_identity(domain) {
-
-  function identity(x) { return +x; }
-
-  identity.invert = identity;
-
-  identity.domain = identity.range = function(x) {
-    if (!arguments.length) return domain;
-    domain = x.map(identity);
-    return identity;
-  };
-
-  identity.ticks = function(m) {
-    return d3_scale_linearTicks(domain, m);
-  };
-
-  identity.tickFormat = function(m) {
-    return d3_scale_linearTickFormat(domain, m);
-  };
-
-  identity.copy = function() {
-    return d3_scale_identity(domain);
-  };
-
-  return identity;
-}
-d3.svg = {};
-d3.svg.arc = function() {
-  var innerRadius = d3_svg_arcInnerRadius,
-      outerRadius = d3_svg_arcOuterRadius,
-      startAngle = d3_svg_arcStartAngle,
-      endAngle = d3_svg_arcEndAngle;
-
-  function arc() {
-    var r0 = innerRadius.apply(this, arguments),
-        r1 = outerRadius.apply(this, arguments),
-        a0 = startAngle.apply(this, arguments) + d3_svg_arcOffset,
-        a1 = endAngle.apply(this, arguments) + d3_svg_arcOffset,
-        da = (a1 < a0 && (da = a0, a0 = a1, a1 = da), a1 - a0),
-        df = da < Math.PI ? "0" : "1",
-        c0 = Math.cos(a0),
-        s0 = Math.sin(a0),
-        c1 = Math.cos(a1),
-        s1 = Math.sin(a1);
-    return da >= d3_svg_arcMax
-      ? (r0
-      ? "M0," + r1
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
-      + "M0," + r0
-      + "A" + r0 + "," + r0 + " 0 1,0 0," + (-r0)
-      + "A" + r0 + "," + r0 + " 0 1,0 0," + r0
-      + "Z"
-      : "M0," + r1
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
-      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
-      + "Z")
-      : (r0
-      ? "M" + r1 * c0 + "," + r1 * s0
-      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
-      + "L" + r0 * c1 + "," + r0 * s1
-      + "A" + r0 + "," + r0 + " 0 " + df + ",0 " + r0 * c0 + "," + r0 * s0
-      + "Z"
-      : "M" + r1 * c0 + "," + r1 * s0
-      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
-      + "L0,0"
-      + "Z");
-  }
-
-  arc.innerRadius = function(v) {
-    if (!arguments.length) return innerRadius;
-    innerRadius = d3.functor(v);
-    return arc;
-  };
-
-  arc.outerRadius = function(v) {
-    if (!arguments.length) return outerRadius;
-    outerRadius = d3.functor(v);
-    return arc;
-  };
-
-  arc.startAngle = function(v) {
-    if (!arguments.length) return startAngle;
-    startAngle = d3.functor(v);
-    return arc;
-  };
-
-  arc.endAngle = function(v) {
-    if (!arguments.length) return endAngle;
-    endAngle = d3.functor(v);
-    return arc;
-  };
-
-  arc.centroid = function() {
-    var r = (innerRadius.apply(this, arguments)
-        + outerRadius.apply(this, arguments)) / 2,
-        a = (startAngle.apply(this, arguments)
-        + endAngle.apply(this, arguments)) / 2 + d3_svg_arcOffset;
-    return [Math.cos(a) * r, Math.sin(a) * r];
-  };
-
-  return arc;
-};
-
-var d3_svg_arcOffset = -Math.PI / 2,
-    d3_svg_arcMax = 2 * Math.PI - 1e-6;
-
-function d3_svg_arcInnerRadius(d) {
-  return d.innerRadius;
-}
-
-function d3_svg_arcOuterRadius(d) {
-  return d.outerRadius;
-}
-
-function d3_svg_arcStartAngle(d) {
-  return d.startAngle;
-}
-
-function d3_svg_arcEndAngle(d) {
-  return d.endAngle;
-}
-function d3_svg_line(projection) {
-  var x = d3_svg_lineX,
-      y = d3_svg_lineY,
-      interpolate = d3_svg_lineInterpolatorDefault,
-      interpolator = d3_svg_lineInterpolators.get(interpolate),
-      tension = .7;
-
-  function line(d) {
-    return d.length < 1 ? null : "M" + interpolator(projection(d3_svg_linePoints(this, d, x, y)), tension);
-  }
-
-  line.x = function(v) {
-    if (!arguments.length) return x;
-    x = v;
-    return line;
-  };
-
-  line.y = function(v) {
-    if (!arguments.length) return y;
-    y = v;
-    return line;
-  };
-
-  line.interpolate = function(v) {
-    if (!arguments.length) return interpolate;
-    if (!d3_svg_lineInterpolators.has(v += "")) v = d3_svg_lineInterpolatorDefault;
-    interpolator = d3_svg_lineInterpolators.get(interpolate = v);
-    return line;
-  };
-
-  line.tension = function(v) {
-    if (!arguments.length) return tension;
-    tension = v;
-    return line;
-  };
-
-  return line;
-}
-
-d3.svg.line = function() {
-  return d3_svg_line(Object);
-};
-
-// Converts the specified array of data into an array of points
-// (x-y tuples), by evaluating the specified `x` and `y` functions on each
-// data point. The `this` context of the evaluated functions is the specified
-// "self" object; each function is passed the current datum and index.
-function d3_svg_linePoints(self, d, x, y) {
-  var points = [],
-      i = -1,
-      n = d.length,
-      fx = typeof x === "function",
-      fy = typeof y === "function",
-      value;
-  if (fx && fy) {
-    while (++i < n) points.push([
-      x.call(self, value = d[i], i),
-      y.call(self, value, i)
-    ]);
-  } else if (fx) {
-    while (++i < n) points.push([x.call(self, d[i], i), y]);
-  } else if (fy) {
-    while (++i < n) points.push([x, y.call(self, d[i], i)]);
-  } else {
-    while (++i < n) points.push([x, y]);
-  }
-  return points;
-}
-
-// The default `x` property, which references d[0].
-function d3_svg_lineX(d) {
-  return d[0];
-}
-
-// The default `y` property, which references d[1].
-function d3_svg_lineY(d) {
-  return d[1];
-}
-
-var d3_svg_lineInterpolatorDefault = "linear";
-
-// The various interpolators supported by the `line` class.
-var d3_svg_lineInterpolators = d3.map({
-  "linear": d3_svg_lineLinear,
-  "step-before": d3_svg_lineStepBefore,
-  "step-after": d3_svg_lineStepAfter,
-  "basis": d3_svg_lineBasis,
-  "basis-open": d3_svg_lineBasisOpen,
-  "basis-closed": d3_svg_lineBasisClosed,
-  "bundle": d3_svg_lineBundle,
-  "cardinal": d3_svg_lineCardinal,
-  "cardinal-open": d3_svg_lineCardinalOpen,
-  "cardinal-closed": d3_svg_lineCardinalClosed,
-  "monotone": d3_svg_lineMonotone
-});
-
-// Linear interpolation; generates "L" commands.
-function d3_svg_lineLinear(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("L", (p = points[i])[0], ",", p[1]);
-  return path.join("");
-}
-
-// Step interpolation; generates "H" and "V" commands.
-function d3_svg_lineStepBefore(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("V", (p = points[i])[1], "H", p[0]);
-  return path.join("");
-}
-
-// Step interpolation; generates "H" and "V" commands.
-function d3_svg_lineStepAfter(points) {
-  var i = 0,
-      n = points.length,
-      p = points[0],
-      path = [p[0], ",", p[1]];
-  while (++i < n) path.push("H", (p = points[i])[0], "V", p[1]);
-  return path.join("");
-}
-
-// Open cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinalOpen(points, tension) {
-  return points.length < 4
-      ? d3_svg_lineLinear(points)
-      : points[1] + d3_svg_lineHermite(points.slice(1, points.length - 1),
-        d3_svg_lineCardinalTangents(points, tension));
-}
-
-// Closed cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinalClosed(points, tension) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] + d3_svg_lineHermite((points.push(points[0]), points),
-        d3_svg_lineCardinalTangents([points[points.length - 2]]
-        .concat(points, [points[1]]), tension));
-}
-
-// Cardinal spline interpolation; generates "C" commands.
-function d3_svg_lineCardinal(points, tension, closed) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] + d3_svg_lineHermite(points,
-        d3_svg_lineCardinalTangents(points, tension));
-}
-
-// Hermite spline construction; generates "C" commands.
-function d3_svg_lineHermite(points, tangents) {
-  if (tangents.length < 1
-      || (points.length != tangents.length
-      && points.length != tangents.length + 2)) {
-    return d3_svg_lineLinear(points);
-  }
-
-  var quad = points.length != tangents.length,
-      path = "",
-      p0 = points[0],
-      p = points[1],
-      t0 = tangents[0],
-      t = t0,
-      pi = 1;
-
-  if (quad) {
-    path += "Q" + (p[0] - t0[0] * 2 / 3) + "," + (p[1] - t0[1] * 2 / 3)
-        + "," + p[0] + "," + p[1];
-    p0 = points[1];
-    pi = 2;
-  }
-
-  if (tangents.length > 1) {
-    t = tangents[1];
-    p = points[pi];
-    pi++;
-    path += "C" + (p0[0] + t0[0]) + "," + (p0[1] + t0[1])
-        + "," + (p[0] - t[0]) + "," + (p[1] - t[1])
-        + "," + p[0] + "," + p[1];
-    for (var i = 2; i < tangents.length; i++, pi++) {
-      p = points[pi];
-      t = tangents[i];
-      path += "S" + (p[0] - t[0]) + "," + (p[1] - t[1])
-          + "," + p[0] + "," + p[1];
-    }
-  }
-
-  if (quad) {
-    var lp = points[pi];
-    path += "Q" + (p[0] + t[0] * 2 / 3) + "," + (p[1] + t[1] * 2 / 3)
-        + "," + lp[0] + "," + lp[1];
-  }
-
-  return path;
-}
-
-// Generates tangents for a cardinal spline.
-function d3_svg_lineCardinalTangents(points, tension) {
-  var tangents = [],
-      a = (1 - tension) / 2,
-      p0,
-      p1 = points[0],
-      p2 = points[1],
-      i = 1,
-      n = points.length;
-  while (++i < n) {
-    p0 = p1;
-    p1 = p2;
-    p2 = points[i];
-    tangents.push([a * (p2[0] - p0[0]), a * (p2[1] - p0[1])]);
-  }
-  return tangents;
-}
-
-// B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasis(points) {
-  if (points.length < 3) return d3_svg_lineLinear(points);
-  var i = 1,
-      n = points.length,
-      pi = points[0],
-      x0 = pi[0],
-      y0 = pi[1],
-      px = [x0, x0, x0, (pi = points[1])[0]],
-      py = [y0, y0, y0, pi[1]],
-      path = [x0, ",", y0];
-  d3_svg_lineBasisBezier(path, px, py);
-  while (++i < n) {
-    pi = points[i];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  i = -1;
-  while (++i < 2) {
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-// Open B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasisOpen(points) {
-  if (points.length < 4) return d3_svg_lineLinear(points);
-  var path = [],
-      i = -1,
-      n = points.length,
-      pi,
-      px = [0],
-      py = [0];
-  while (++i < 3) {
-    pi = points[i];
-    px.push(pi[0]);
-    py.push(pi[1]);
-  }
-  path.push(d3_svg_lineDot4(d3_svg_lineBasisBezier3, px)
-    + "," + d3_svg_lineDot4(d3_svg_lineBasisBezier3, py));
-  --i; while (++i < n) {
-    pi = points[i];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-// Closed B-spline interpolation; generates "C" commands.
-function d3_svg_lineBasisClosed(points) {
-  var path,
-      i = -1,
-      n = points.length,
-      m = n + 4,
-      pi,
-      px = [],
-      py = [];
-  while (++i < 4) {
-    pi = points[i % n];
-    px.push(pi[0]);
-    py.push(pi[1]);
-  }
-  path = [
-    d3_svg_lineDot4(d3_svg_lineBasisBezier3, px), ",",
-    d3_svg_lineDot4(d3_svg_lineBasisBezier3, py)
-  ];
-  --i; while (++i < m) {
-    pi = points[i % n];
-    px.shift(); px.push(pi[0]);
-    py.shift(); py.push(pi[1]);
-    d3_svg_lineBasisBezier(path, px, py);
-  }
-  return path.join("");
-}
-
-function d3_svg_lineBundle(points, tension) {
-  var n = points.length - 1,
-      x0 = points[0][0],
-      y0 = points[0][1],
-      dx = points[n][0] - x0,
-      dy = points[n][1] - y0,
-      i = -1,
-      p,
-      t;
-  while (++i <= n) {
-    p = points[i];
-    t = i / n;
-    p[0] = tension * p[0] + (1 - tension) * (x0 + t * dx);
-    p[1] = tension * p[1] + (1 - tension) * (y0 + t * dy);
-  }
-  return d3_svg_lineBasis(points);
-}
-
-// Returns the dot product of the given four-element vectors.
-function d3_svg_lineDot4(a, b) {
-  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
-}
-
-// Matrix to transform basis (b-spline) control points to bezier
-// control points. Derived from FvD 11.2.8.
-var d3_svg_lineBasisBezier1 = [0, 2/3, 1/3, 0],
-    d3_svg_lineBasisBezier2 = [0, 1/3, 2/3, 0],
-    d3_svg_lineBasisBezier3 = [0, 1/6, 2/3, 1/6];
-
-// Pushes a "C" Bézier curve onto the specified path array, given the
-// two specified four-element arrays which define the control points.
-function d3_svg_lineBasisBezier(path, x, y) {
-  path.push(
-      "C", d3_svg_lineDot4(d3_svg_lineBasisBezier1, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier1, y),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, y),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, x),
-      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, y));
-}
-
-// Computes the slope from points p0 to p1.
-function d3_svg_lineSlope(p0, p1) {
-  return (p1[1] - p0[1]) / (p1[0] - p0[0]);
-}
-
-// Compute three-point differences for the given points.
-// http://en.wikipedia.org/wiki/Cubic_Hermite_spline#Finite_difference
-function d3_svg_lineFiniteDifferences(points) {
-  var i = 0,
-      j = points.length - 1,
-      m = [],
-      p0 = points[0],
-      p1 = points[1],
-      d = m[0] = d3_svg_lineSlope(p0, p1);
-  while (++i < j) {
-    m[i] = d + (d = d3_svg_lineSlope(p0 = p1, p1 = points[i + 1]));
-  }
-  m[i] = d;
-  return m;
-}
-
-// Interpolates the given points using Fritsch-Carlson Monotone cubic Hermite
-// interpolation. Returns an array of tangent vectors. For details, see
-// http://en.wikipedia.org/wiki/Monotone_cubic_interpolation
-function d3_svg_lineMonotoneTangents(points) {
-  var tangents = [],
-      d,
-      a,
-      b,
-      s,
-      m = d3_svg_lineFiniteDifferences(points),
-      i = -1,
-      j = points.length - 1;
-
-  // The first two steps are done by computing finite-differences:
-  // 1. Compute the slopes of the secant lines between successive points.
-  // 2. Initialize the tangents at every point as the average of the secants.
-
-  // Then, for each segment…
-  while (++i < j) {
-    d = d3_svg_lineSlope(points[i], points[i + 1]);
-
-    // 3. If two successive yk = y{k + 1} are equal (i.e., d is zero), then set
-    // mk = m{k + 1} = 0 as the spline connecting these points must be flat to
-    // preserve monotonicity. Ignore step 4 and 5 for those k.
-
-    if (Math.abs(d) < 1e-6) {
-      m[i] = m[i + 1] = 0;
-    } else {
-      // 4. Let ak = mk / dk and bk = m{k + 1} / dk.
-      a = m[i] / d;
-      b = m[i + 1] / d;
-
-      // 5. Prevent overshoot and ensure monotonicity by restricting the
-      // magnitude of vector <ak, bk> to a circle of radius 3.
-      s = a * a + b * b;
-      if (s > 9) {
-        s = d * 3 / Math.sqrt(s);
-        m[i] = s * a;
-        m[i + 1] = s * b;
-      }
-    }
-  }
-
-  // Compute the normalized tangent vector from the slopes. Note that if x is
-  // not monotonic, it's possible that the slope will be infinite, so we protect
-  // against NaN by setting the coordinate to zero.
-  i = -1; while (++i <= j) {
-    s = (points[Math.min(j, i + 1)][0] - points[Math.max(0, i - 1)][0])
-      / (6 * (1 + m[i] * m[i]));
-    tangents.push([s || 0, m[i] * s || 0]);
-  }
-
-  return tangents;
-}
-
-function d3_svg_lineMonotone(points) {
-  return points.length < 3
-      ? d3_svg_lineLinear(points)
-      : points[0] +
-        d3_svg_lineHermite(points, d3_svg_lineMonotoneTangents(points));
-}
-d3.svg.line.radial = function() {
-  var line = d3_svg_line(d3_svg_lineRadial);
-  line.radius = line.x, delete line.x;
-  line.angle = line.y, delete line.y;
-  return line;
-};
-
-function d3_svg_lineRadial(points) {
-  var point,
-      i = -1,
-      n = points.length,
-      r,
-      a;
-  while (++i < n) {
-    point = points[i];
-    r = point[0];
-    a = point[1] + d3_svg_arcOffset;
-    point[0] = r * Math.cos(a);
-    point[1] = r * Math.sin(a);
-  }
-  return points;
-}
-function d3_svg_area(projection) {
-  var x0 = d3_svg_lineX,
-      x1 = d3_svg_lineX,
-      y0 = 0,
-      y1 = d3_svg_lineY,
-      interpolate,
-      i0,
-      i1,
-      tension = .7;
-
-  function area(d) {
-    if (d.length < 1) return null;
-    var points0 = d3_svg_linePoints(this, d, x0, y0),
-        points1 = d3_svg_linePoints(this, d, x0 === x1 ? d3_svg_areaX(points0) : x1, y0 === y1 ? d3_svg_areaY(points0) : y1);
-    return "M" + i0(projection(points1), tension)
-         + "L" + i1(projection(points0.reverse()), tension)
-         + "Z";
-  }
-
-  area.x = function(x) {
-    if (!arguments.length) return x1;
-    x0 = x1 = x;
-    return area;
-  };
-
-  area.x0 = function(x) {
-    if (!arguments.length) return x0;
-    x0 = x;
-    return area;
-  };
-
-  area.x1 = function(x) {
-    if (!arguments.length) return x1;
-    x1 = x;
-    return area;
-  };
-
-  area.y = function(y) {
-    if (!arguments.length) return y1;
-    y0 = y1 = y;
-    return area;
-  };
-
-  area.y0 = function(y) {
-    if (!arguments.length) return y0;
-    y0 = y;
-    return area;
-  };
-
-  area.y1 = function(y) {
-    if (!arguments.length) return y1;
-    y1 = y;
-    return area;
-  };
-
-  area.interpolate = function(x) {
-    if (!arguments.length) return interpolate;
-    if (!d3_svg_lineInterpolators.has(x += "")) x = d3_svg_lineInterpolatorDefault;
-    i0 = d3_svg_lineInterpolators.get(interpolate = x);
-    i1 = i0.reverse || i0;
-    return area;
-  };
-
-  area.tension = function(x) {
-    if (!arguments.length) return tension;
-    tension = x;
-    return area;
-  };
-
-  return area.interpolate("linear");
-}
-
-d3_svg_lineStepBefore.reverse = d3_svg_lineStepAfter;
-d3_svg_lineStepAfter.reverse = d3_svg_lineStepBefore;
-
-d3.svg.area = function() {
-  return d3_svg_area(Object);
-};
-
-function d3_svg_areaX(points) {
-  return function(d, i) {
-    return points[i][0];
-  };
-}
-
-function d3_svg_areaY(points) {
-  return function(d, i) {
-    return points[i][1];
-  };
-}
-d3.svg.area.radial = function() {
-  var area = d3_svg_area(d3_svg_lineRadial);
-  area.radius = area.x, delete area.x;
-  area.innerRadius = area.x0, delete area.x0;
-  area.outerRadius = area.x1, delete area.x1;
-  area.angle = area.y, delete area.y;
-  area.startAngle = area.y0, delete area.y0;
-  area.endAngle = area.y1, delete area.y1;
-  return area;
-};
-d3.svg.chord = function() {
-  var source = d3_svg_chordSource,
-      target = d3_svg_chordTarget,
-      radius = d3_svg_chordRadius,
-      startAngle = d3_svg_arcStartAngle,
-      endAngle = d3_svg_arcEndAngle;
-
-  // TODO Allow control point to be customized.
-
-  function chord(d, i) {
-    var s = subgroup(this, source, d, i),
-        t = subgroup(this, target, d, i);
-    return "M" + s.p0
-      + arc(s.r, s.p1, s.a1 - s.a0) + (equals(s, t)
-      ? curve(s.r, s.p1, s.r, s.p0)
-      : curve(s.r, s.p1, t.r, t.p0)
-      + arc(t.r, t.p1, t.a1 - t.a0)
-      + curve(t.r, t.p1, s.r, s.p0))
-      + "Z";
-  }
-
-  function subgroup(self, f, d, i) {
-    var subgroup = f.call(self, d, i),
-        r = radius.call(self, subgroup, i),
-        a0 = startAngle.call(self, subgroup, i) + d3_svg_arcOffset,
-        a1 = endAngle.call(self, subgroup, i) + d3_svg_arcOffset;
-    return {
-      r: r,
-      a0: a0,
-      a1: a1,
-      p0: [r * Math.cos(a0), r * Math.sin(a0)],
-      p1: [r * Math.cos(a1), r * Math.sin(a1)]
-    };
-  }
-
-  function equals(a, b) {
-    return a.a0 == b.a0 && a.a1 == b.a1;
-  }
-
-  function arc(r, p, a) {
-    return "A" + r + "," + r + " 0 " + +(a > Math.PI) + ",1 " + p;
-  }
-
-  function curve(r0, p0, r1, p1) {
-    return "Q 0,0 " + p1;
-  }
-
-  chord.radius = function(v) {
-    if (!arguments.length) return radius;
-    radius = d3.functor(v);
-    return chord;
-  };
-
-  chord.source = function(v) {
-    if (!arguments.length) return source;
-    source = d3.functor(v);
-    return chord;
-  };
-
-  chord.target = function(v) {
-    if (!arguments.length) return target;
-    target = d3.functor(v);
-    return chord;
-  };
-
-  chord.startAngle = function(v) {
-    if (!arguments.length) return startAngle;
-    startAngle = d3.functor(v);
-    return chord;
-  };
-
-  chord.endAngle = function(v) {
-    if (!arguments.length) return endAngle;
-    endAngle = d3.functor(v);
-    return chord;
-  };
-
-  return chord;
-};
-
-function d3_svg_chordSource(d) {
-  return d.source;
-}
-
-function d3_svg_chordTarget(d) {
-  return d.target;
-}
-
-function d3_svg_chordRadius(d) {
-  return d.radius;
-}
-
-function d3_svg_chordStartAngle(d) {
-  return d.startAngle;
-}
-
-function d3_svg_chordEndAngle(d) {
-  return d.endAngle;
-}
-d3.svg.diagonal = function() {
-  var source = d3_svg_chordSource,
-      target = d3_svg_chordTarget,
-      projection = d3_svg_diagonalProjection;
-
-  function diagonal(d, i) {
-    var p0 = source.call(this, d, i),
-        p3 = target.call(this, d, i),
-        m = (p0.y + p3.y) / 2,
-        p = [p0, {x: p0.x, y: m}, {x: p3.x, y: m}, p3];
-    p = p.map(projection);
-    return "M" + p[0] + "C" + p[1] + " " + p[2] + " " + p[3];
-  }
-
-  diagonal.source = function(x) {
-    if (!arguments.length) return source;
-    source = d3.functor(x);
-    return diagonal;
-  };
-
-  diagonal.target = function(x) {
-    if (!arguments.length) return target;
-    target = d3.functor(x);
-    return diagonal;
-  };
-
-  diagonal.projection = function(x) {
-    if (!arguments.length) return projection;
-    projection = x;
-    return diagonal;
-  };
-
-  return diagonal;
-};
-
-function d3_svg_diagonalProjection(d) {
-  return [d.x, d.y];
-}
-d3.svg.diagonal.radial = function() {
-  var diagonal = d3.svg.diagonal(),
-      projection = d3_svg_diagonalProjection,
-      projection_ = diagonal.projection;
-
-  diagonal.projection = function(x) {
-    return arguments.length
-        ? projection_(d3_svg_diagonalRadialProjection(projection = x))
-        : projection;
-  };
-
-  return diagonal;
-};
-
-function d3_svg_diagonalRadialProjection(projection) {
-  return function() {
-    var d = projection.apply(this, arguments),
-        r = d[0],
-        a = d[1] + d3_svg_arcOffset;
-    return [r * Math.cos(a), r * Math.sin(a)];
-  };
-}
-d3.svg.mouse = d3.mouse;
-d3.svg.touches = d3.touches;
-d3.svg.symbol = function() {
-  var type = d3_svg_symbolType,
-      size = d3_svg_symbolSize;
-
-  function symbol(d, i) {
-    return (d3_svg_symbols.get(type.call(this, d, i))
-        || d3_svg_symbolCircle)
-        (size.call(this, d, i));
-  }
-
-  symbol.type = function(x) {
-    if (!arguments.length) return type;
-    type = d3.functor(x);
-    return symbol;
-  };
-
-  // size of symbol in square pixels
-  symbol.size = function(x) {
-    if (!arguments.length) return size;
-    size = d3.functor(x);
-    return symbol;
-  };
-
-  return symbol;
-};
-
-function d3_svg_symbolSize() {
-  return 64;
-}
-
-function d3_svg_symbolType() {
-  return "circle";
-}
-
-function d3_svg_symbolCircle(size) {
-  var r = Math.sqrt(size / Math.PI);
-  return "M0," + r
-      + "A" + r + "," + r + " 0 1,1 0," + (-r)
-      + "A" + r + "," + r + " 0 1,1 0," + r
-      + "Z";
-}
-
-// TODO cross-diagonal?
-var d3_svg_symbols = d3.map({
-  "circle": d3_svg_symbolCircle,
-  "cross": function(size) {
-    var r = Math.sqrt(size / 5) / 2;
-    return "M" + -3 * r + "," + -r
-        + "H" + -r
-        + "V" + -3 * r
-        + "H" + r
-        + "V" + -r
-        + "H" + 3 * r
-        + "V" + r
-        + "H" + r
-        + "V" + 3 * r
-        + "H" + -r
-        + "V" + r
-        + "H" + -3 * r
-        + "Z";
-  },
-  "diamond": function(size) {
-    var ry = Math.sqrt(size / (2 * d3_svg_symbolTan30)),
-        rx = ry * d3_svg_symbolTan30;
-    return "M0," + -ry
-        + "L" + rx + ",0"
-        + " 0," + ry
-        + " " + -rx + ",0"
-        + "Z";
-  },
-  "square": function(size) {
-    var r = Math.sqrt(size) / 2;
-    return "M" + -r + "," + -r
-        + "L" + r + "," + -r
-        + " " + r + "," + r
-        + " " + -r + "," + r
-        + "Z";
-  },
-  "triangle-down": function(size) {
-    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
-        ry = rx * d3_svg_symbolSqrt3 / 2;
-    return "M0," + ry
-        + "L" + rx +"," + -ry
-        + " " + -rx + "," + -ry
-        + "Z";
-  },
-  "triangle-up": function(size) {
-    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
-        ry = rx * d3_svg_symbolSqrt3 / 2;
-    return "M0," + -ry
-        + "L" + rx +"," + ry
-        + " " + -rx + "," + ry
-        + "Z";
-  }
-});
-
-d3.svg.symbolTypes = d3_svg_symbols.keys();
-
-var d3_svg_symbolSqrt3 = Math.sqrt(3),
-    d3_svg_symbolTan30 = Math.tan(30 * Math.PI / 180);
-d3.svg.axis = function() {
-  var scale = d3.scale.linear(),
-      orient = "bottom",
-      tickMajorSize = 6,
-      tickMinorSize = 6,
-      tickEndSize = 6,
-      tickPadding = 3,
-      tickArguments_ = [10],
-      tickValues = null,
-      tickFormat_,
-      tickSubdivide = 0;
-
-  function axis(g) {
-    g.each(function() {
-      var g = d3.select(this);
-
-      // Ticks, or domain values for ordinal scales.
-      var ticks = tickValues == null ? (scale.ticks ? scale.ticks.apply(scale, tickArguments_) : scale.domain()) : tickValues,
-          tickFormat = tickFormat_ == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments_) : String) : tickFormat_;
-
-      // Minor ticks.
-      var subticks = d3_svg_axisSubdivide(scale, ticks, tickSubdivide),
-          subtick = g.selectAll(".minor").data(subticks, String),
-          subtickEnter = subtick.enter().insert("line", "g").attr("class", "tick minor").style("opacity", 1e-6),
-          subtickExit = d3.transition(subtick.exit()).style("opacity", 1e-6).remove(),
-          subtickUpdate = d3.transition(subtick).style("opacity", 1);
-
-      // Major ticks.
-      var tick = g.selectAll("g").data(ticks, String),
-          tickEnter = tick.enter().insert("g", "path").style("opacity", 1e-6),
-          tickExit = d3.transition(tick.exit()).style("opacity", 1e-6).remove(),
-          tickUpdate = d3.transition(tick).style("opacity", 1),
-          tickTransform;
-
-      // Domain.
-      var range = d3_scaleRange(scale),
-          path = g.selectAll(".domain").data([0]),
-          pathEnter = path.enter().append("path").attr("class", "domain"),
-          pathUpdate = d3.transition(path);
-
-      // Stash a snapshot of the new scale, and retrieve the old snapshot.
-      var scale1 = scale.copy(),
-          scale0 = this.__chart__ || scale1;
-      this.__chart__ = scale1;
-
-      tickEnter.append("line").attr("class", "tick");
-      tickEnter.append("text");
-      tickUpdate.select("text").text(tickFormat);
-
-      switch (orient) {
-        case "bottom": {
-          tickTransform = d3_svg_axisX;
-          subtickEnter.attr("y2", tickMinorSize);
-          subtickUpdate.attr("x2", 0).attr("y2", tickMinorSize);
-          tickEnter.select("line").attr("y2", tickMajorSize);
-          tickEnter.select("text").attr("y", Math.max(tickMajorSize, 0) + tickPadding);
-          tickUpdate.select("line").attr("x2", 0).attr("y2", tickMajorSize);
-          tickUpdate.select("text").attr("x", 0).attr("y", Math.max(tickMajorSize, 0) + tickPadding).attr("dy", ".71em").attr("text-anchor", "middle");
-          pathUpdate.attr("d", "M" + range[0] + "," + tickEndSize + "V0H" + range[1] + "V" + tickEndSize);
-          break;
-        }
-        case "top": {
-          tickTransform = d3_svg_axisX;
-          subtickEnter.attr("y2", -tickMinorSize);
-          subtickUpdate.attr("x2", 0).attr("y2", -tickMinorSize);
-          tickEnter.select("line").attr("y2", -tickMajorSize);
-          tickEnter.select("text").attr("y", -(Math.max(tickMajorSize, 0) + tickPadding));
-          tickUpdate.select("line").attr("x2", 0).attr("y2", -tickMajorSize);
-          tickUpdate.select("text").attr("x", 0).attr("y", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("dy", "0em").attr("text-anchor", "middle");
-          pathUpdate.attr("d", "M" + range[0] + "," + -tickEndSize + "V0H" + range[1] + "V" + -tickEndSize);
-          break;
-        }
-        case "left": {
-          tickTransform = d3_svg_axisY;
-          subtickEnter.attr("x2", -tickMinorSize);
-          subtickUpdate.attr("x2", -tickMinorSize).attr("y2", 0);
-          tickEnter.select("line").attr("x2", -tickMajorSize);
-          tickEnter.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding));
-          tickUpdate.select("line").attr("x2", -tickMajorSize).attr("y2", 0);
-          tickUpdate.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "end");
-          pathUpdate.attr("d", "M" + -tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + -tickEndSize);
-          break;
-        }
-        case "right": {
-          tickTransform = d3_svg_axisY;
-          subtickEnter.attr("x2", tickMinorSize);
-          subtickUpdate.attr("x2", tickMinorSize).attr("y2", 0);
-          tickEnter.select("line").attr("x2", tickMajorSize);
-          tickEnter.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding);
-          tickUpdate.select("line").attr("x2", tickMajorSize).attr("y2", 0);
-          tickUpdate.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "start");
-          pathUpdate.attr("d", "M" + tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + tickEndSize);
-          break;
-        }
-      }
-
-      // For quantitative scales:
-      // - enter new ticks from the old scale
-      // - exit old ticks to the new scale
-      if (scale.ticks) {
-        tickEnter.call(tickTransform, scale0);
-        tickUpdate.call(tickTransform, scale1);
-        tickExit.call(tickTransform, scale1);
-        subtickEnter.call(tickTransform, scale0);
-        subtickUpdate.call(tickTransform, scale1);
-        subtickExit.call(tickTransform, scale1);
-      }
-
-      // For ordinal scales:
-      // - any entering ticks are undefined in the old scale
-      // - any exiting ticks are undefined in the new scale
-      // Therefore, we only need to transition updating ticks.
-      else {
-        var dx = scale1.rangeBand() / 2, x = function(d) { return scale1(d) + dx; };
-        tickEnter.call(tickTransform, x);
-        tickUpdate.call(tickTransform, x);
-      }
-    });
-  }
-
-  axis.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = x;
-    return axis;
-  };
-
-  axis.orient = function(x) {
-    if (!arguments.length) return orient;
-    orient = x;
-    return axis;
-  };
-
-  axis.ticks = function() {
-    if (!arguments.length) return tickArguments_;
-    tickArguments_ = arguments;
-    return axis;
-  };
-
-  axis.tickValues = function(x) {
-    if (!arguments.length) return tickValues;
-    tickValues = x;
-    return axis;
-  };
-
-  axis.tickFormat = function(x) {
-    if (!arguments.length) return tickFormat_;
-    tickFormat_ = x;
-    return axis;
-  };
-
-  axis.tickSize = function(x, y, z) {
-    if (!arguments.length) return tickMajorSize;
-    var n = arguments.length - 1;
-    tickMajorSize = +x;
-    tickMinorSize = n > 1 ? +y : tickMajorSize;
-    tickEndSize = n > 0 ? +arguments[n] : tickMajorSize;
-    return axis;
-  };
-
-  axis.tickPadding = function(x) {
-    if (!arguments.length) return tickPadding;
-    tickPadding = +x;
-    return axis;
-  };
-
-  axis.tickSubdivide = function(x) {
-    if (!arguments.length) return tickSubdivide;
-    tickSubdivide = +x;
-    return axis;
-  };
-
-  return axis;
-};
-
-function d3_svg_axisX(selection, x) {
-  selection.attr("transform", function(d) { return "translate(" + x(d) + ",0)"; });
-}
-
-function d3_svg_axisY(selection, y) {
-  selection.attr("transform", function(d) { return "translate(0," + y(d) + ")"; });
-}
-
-function d3_svg_axisSubdivide(scale, ticks, m) {
-  subticks = [];
-  if (m && ticks.length > 1) {
-    var extent = d3_scaleExtent(scale.domain()),
-        subticks,
-        i = -1,
-        n = ticks.length,
-        d = (ticks[1] - ticks[0]) / ++m,
-        j,
-        v;
-    while (++i < n) {
-      for (j = m; --j > 0;) {
-        if ((v = +ticks[i] - j * d) >= extent[0]) {
-          subticks.push(v);
-        }
-      }
-    }
-    for (--i, j = 0; ++j < m && (v = +ticks[i] + j * d) < extent[1];) {
-      subticks.push(v);
-    }
-  }
-  return subticks;
-}
-d3.svg.brush = function() {
-  var event = d3_eventDispatch(brush, "brushstart", "brush", "brushend"),
-      x = null, // x-scale, optional
-      y = null, // y-scale, optional
-      resizes = d3_svg_brushResizes[0],
-      extent = [[0, 0], [0, 0]], // [x0, y0], [x1, y1], in pixels (integers)
-      extentDomain; // the extent in data space, lazily created
-
-  function brush(g) {
-    g.each(function() {
-      var g = d3.select(this),
-          bg = g.selectAll(".background").data([0]),
-          fg = g.selectAll(".extent").data([0]),
-          tz = g.selectAll(".resize").data(resizes, String),
-          e;
-
-      // Prepare the brush container for events.
-      g
-          .style("pointer-events", "all")
-          .on("mousedown.brush", brushstart)
-          .on("touchstart.brush", brushstart);
-
-      // An invisible, mouseable area for starting a new brush.
-      bg.enter().append("rect")
-          .attr("class", "background")
-          .style("visibility", "hidden")
-          .style("cursor", "crosshair");
-
-      // The visible brush extent; style this as you like!
-      fg.enter().append("rect")
-          .attr("class", "extent")
-          .style("cursor", "move");
-
-      // More invisible rects for resizing the extent.
-      tz.enter().append("g")
-          .attr("class", function(d) { return "resize " + d; })
-          .style("cursor", function(d) { return d3_svg_brushCursor[d]; })
-        .append("rect")
-          .attr("x", function(d) { return /[ew]$/.test(d) ? -3 : null; })
-          .attr("y", function(d) { return /^[ns]/.test(d) ? -3 : null; })
-          .attr("width", 6)
-          .attr("height", 6)
-          .style("visibility", "hidden");
-
-      // Show or hide the resizers.
-      tz.style("display", brush.empty() ? "none" : null);
-
-      // Remove any superfluous resizers.
-      tz.exit().remove();
-
-      // Initialize the background to fill the defined range.
-      // If the range isn't defined, you can post-process.
-      if (x) {
-        e = d3_scaleRange(x);
-        bg.attr("x", e[0]).attr("width", e[1] - e[0]);
-        redrawX(g);
-      }
-      if (y) {
-        e = d3_scaleRange(y);
-        bg.attr("y", e[0]).attr("height", e[1] - e[0]);
-        redrawY(g);
-      }
-      redraw(g);
-    });
-  }
-
-  function redraw(g) {
-    g.selectAll(".resize").attr("transform", function(d) {
-      return "translate(" + extent[+/e$/.test(d)][0] + "," + extent[+/^s/.test(d)][1] + ")";
-    });
-  }
-
-  function redrawX(g) {
-    g.select(".extent").attr("x", extent[0][0]);
-    g.selectAll(".extent,.n>rect,.s>rect").attr("width", extent[1][0] - extent[0][0]);
-  }
-
-  function redrawY(g) {
-    g.select(".extent").attr("y", extent[0][1]);
-    g.selectAll(".extent,.e>rect,.w>rect").attr("height", extent[1][1] - extent[0][1]);
-  }
-
-  function brushstart() {
-    var target = this,
-        eventTarget = d3.select(d3.event.target),
-        event_ = event.of(target, arguments),
-        g = d3.select(target),
-        resizing = eventTarget.datum(),
-        resizingX = !/^(n|s)$/.test(resizing) && x,
-        resizingY = !/^(e|w)$/.test(resizing) && y,
-        dragging = eventTarget.classed("extent"),
-        center,
-        origin = mouse(),
-        offset;
-
-    var w = d3.select(window)
-        .on("mousemove.brush", brushmove)
-        .on("mouseup.brush", brushend)
-        .on("touchmove.brush", brushmove)
-        .on("touchend.brush", brushend)
-        .on("keydown.brush", keydown)
-        .on("keyup.brush", keyup);
-
-    // If the extent was clicked on, drag rather than brush;
-    // store the point between the mouse and extent origin instead.
-    if (dragging) {
-      origin[0] = extent[0][0] - origin[0];
-      origin[1] = extent[0][1] - origin[1];
-    }
-
-    // If a resizer was clicked on, record which side is to be resized.
-    // Also, set the origin to the opposite side.
-    else if (resizing) {
-      var ex = +/w$/.test(resizing),
-          ey = +/^n/.test(resizing);
-      offset = [extent[1 - ex][0] - origin[0], extent[1 - ey][1] - origin[1]];
-      origin[0] = extent[ex][0];
-      origin[1] = extent[ey][1];
-    }
-
-    // If the ALT key is down when starting a brush, the center is at the mouse.
-    else if (d3.event.altKey) center = origin.slice();
-
-    // Propagate the active cursor to the body for the drag duration.
-    g.style("pointer-events", "none").selectAll(".resize").style("display", null);
-    d3.select("body").style("cursor", eventTarget.style("cursor"));
-
-    // Notify listeners.
-    event_({type: "brushstart"});
-    brushmove();
-    d3_eventCancel();
-
-    function mouse() {
-      var touches = d3.event.changedTouches;
-      return touches ? d3.touches(target, touches)[0] : d3.mouse(target);
-    }
-
-    function keydown() {
-      if (d3.event.keyCode == 32) {
-        if (!dragging) {
-          center = null;
-          origin[0] -= extent[1][0];
-          origin[1] -= extent[1][1];
-          dragging = 2;
-        }
-        d3_eventCancel();
-      }
-    }
-
-    function keyup() {
-      if (d3.event.keyCode == 32 && dragging == 2) {
-        origin[0] += extent[1][0];
-        origin[1] += extent[1][1];
-        dragging = 0;
-        d3_eventCancel();
-      }
-    }
-
-    function brushmove() {
-      var point = mouse(),
-          moved = false;
-
-      // Preserve the offset for thick resizers.
-      if (offset) {
-        point[0] += offset[0];
-        point[1] += offset[1];
-      }
-
-      if (!dragging) {
-
-        // If needed, determine the center from the current extent.
-        if (d3.event.altKey) {
-          if (!center) center = [(extent[0][0] + extent[1][0]) / 2, (extent[0][1] + extent[1][1]) / 2];
-
-          // Update the origin, for when the ALT key is released.
-          origin[0] = extent[+(point[0] < center[0])][0];
-          origin[1] = extent[+(point[1] < center[1])][1];
-        }
-
-        // When the ALT key is released, we clear the center.
-        else center = null;
-      }
-
-      // Update the brush extent for each dimension.
-      if (resizingX && move1(point, x, 0)) {
-        redrawX(g);
-        moved = true;
-      }
-      if (resizingY && move1(point, y, 1)) {
-        redrawY(g);
-        moved = true;
-      }
-
-      // Final redraw and notify listeners.
-      if (moved) {
-        redraw(g);
-        event_({type: "brush", mode: dragging ? "move" : "resize"});
-      }
-    }
-
-    function move1(point, scale, i) {
-      var range = d3_scaleRange(scale),
-          r0 = range[0],
-          r1 = range[1],
-          position = origin[i],
-          size = extent[1][i] - extent[0][i],
-          min,
-          max;
-
-      // When dragging, reduce the range by the extent size and position.
-      if (dragging) {
-        r0 -= position;
-        r1 -= size + position;
-      }
-
-      // Clamp the point so that the extent fits within the range extent.
-      min = Math.max(r0, Math.min(r1, point[i]));
-
-      // Compute the new extent bounds.
-      if (dragging) {
-        max = (min += position) + size;
-      } else {
-
-        // If the ALT key is pressed, then preserve the center of the extent.
-        if (center) position = Math.max(r0, Math.min(r1, 2 * center[i] - min));
-
-        // Compute the min and max of the position and point.
-        if (position < min) {
-          max = min;
-          min = position;
-        } else {
-          max = position;
-        }
-      }
-
-      // Update the stored bounds.
-      if (extent[0][i] !== min || extent[1][i] !== max) {
-        extentDomain = null;
-        extent[0][i] = min;
-        extent[1][i] = max;
-        return true;
-      }
-    }
-
-    function brushend() {
-      brushmove();
-
-      // reset the cursor styles
-      g.style("pointer-events", "all").selectAll(".resize").style("display", brush.empty() ? "none" : null);
-      d3.select("body").style("cursor", null);
-
-      w .on("mousemove.brush", null)
-        .on("mouseup.brush", null)
-        .on("touchmove.brush", null)
-        .on("touchend.brush", null)
-        .on("keydown.brush", null)
-        .on("keyup.brush", null);
-
-      event_({type: "brushend"});
-      d3_eventCancel();
-    }
-  }
-
-  brush.x = function(z) {
-    if (!arguments.length) return x;
-    x = z;
-    resizes = d3_svg_brushResizes[!x << 1 | !y]; // fore!
-    return brush;
-  };
-
-  brush.y = function(z) {
-    if (!arguments.length) return y;
-    y = z;
-    resizes = d3_svg_brushResizes[!x << 1 | !y]; // fore!
-    return brush;
-  };
-
-  brush.extent = function(z) {
-    var x0, x1, y0, y1, t;
-
-    // Invert the pixel extent to data-space.
-    if (!arguments.length) {
-      z = extentDomain || extent;
-      if (x) {
-        x0 = z[0][0], x1 = z[1][0];
-        if (!extentDomain) {
-          x0 = extent[0][0], x1 = extent[1][0];
-          if (x.invert) x0 = x.invert(x0), x1 = x.invert(x1);
-          if (x1 < x0) t = x0, x0 = x1, x1 = t;
-        }
-      }
-      if (y) {
-        y0 = z[0][1], y1 = z[1][1];
-        if (!extentDomain) {
-          y0 = extent[0][1], y1 = extent[1][1];
-          if (y.invert) y0 = y.invert(y0), y1 = y.invert(y1);
-          if (y1 < y0) t = y0, y0 = y1, y1 = t;
-        }
-      }
-      return x && y ? [[x0, y0], [x1, y1]] : x ? [x0, x1] : y && [y0, y1];
-    }
-
-    // Scale the data-space extent to pixels.
-    extentDomain = [[0, 0], [0, 0]];
-    if (x) {
-      x0 = z[0], x1 = z[1];
-      if (y) x0 = x0[0], x1 = x1[0];
-      extentDomain[0][0] = x0, extentDomain[1][0] = x1;
-      if (x.invert) x0 = x(x0), x1 = x(x1);
-      if (x1 < x0) t = x0, x0 = x1, x1 = t;
-      extent[0][0] = x0 | 0, extent[1][0] = x1 | 0;
-    }
-    if (y) {
-      y0 = z[0], y1 = z[1];
-      if (x) y0 = y0[1], y1 = y1[1];
-      extentDomain[0][1] = y0, extentDomain[1][1] = y1;
-      if (y.invert) y0 = y(y0), y1 = y(y1);
-      if (y1 < y0) t = y0, y0 = y1, y1 = t;
-      extent[0][1] = y0 | 0, extent[1][1] = y1 | 0;
-    }
-
-    return brush;
-  };
-
-  brush.clear = function() {
-    extentDomain = null;
-    extent[0][0] =
-    extent[0][1] =
-    extent[1][0] =
-    extent[1][1] = 0;
-    return brush;
-  };
-
-  brush.empty = function() {
-    return (x && extent[0][0] === extent[1][0])
-        || (y && extent[0][1] === extent[1][1]);
-  };
-
-  return d3.rebind(brush, event, "on");
-};
-
-var d3_svg_brushCursor = {
-  n: "ns-resize",
-  e: "ew-resize",
-  s: "ns-resize",
-  w: "ew-resize",
-  nw: "nwse-resize",
-  ne: "nesw-resize",
-  se: "nwse-resize",
-  sw: "nesw-resize"
-};
-
-var d3_svg_brushResizes = [
-  ["n", "e", "s", "w", "nw", "ne", "se", "sw"],
-  ["e", "w"],
-  ["n", "s"],
-  []
-];
-d3.behavior = {};
-// TODO Track touch points by identifier.
-
-d3.behavior.drag = function() {
-  var event = d3_eventDispatch(drag, "drag", "dragstart", "dragend"),
-      origin = null;
-
-  function drag() {
-    this.on("mousedown.drag", mousedown)
-        .on("touchstart.drag", mousedown);
-  }
-
-  function mousedown() {
-    var target = this,
-        event_ = event.of(target, arguments),
-        eventTarget = d3.event.target,
-        offset,
-        origin_ = point(),
-        moved = 0;
-
-    var w = d3.select(window)
-        .on("mousemove.drag", dragmove)
-        .on("touchmove.drag", dragmove)
-        .on("mouseup.drag", dragend, true)
-        .on("touchend.drag", dragend, true);
-
-    if (origin) {
-      offset = origin.apply(target, arguments);
-      offset = [offset.x - origin_[0], offset.y - origin_[1]];
-    } else {
-      offset = [0, 0];
-    }
-
-    event_({type: "dragstart"});
-
-    function point() {
-      var p = target.parentNode,
-          t = d3.event.changedTouches;
-      return t ? d3.touches(p, t)[0] : d3.mouse(p);
-    }
-
-    function dragmove() {
-      if (!target.parentNode) return dragend(); // target removed from DOM
-
-      var p = point(),
-          dx = p[0] - origin_[0],
-          dy = p[1] - origin_[1];
-
-      moved |= dx | dy;
-      origin_ = p;
-      d3_eventCancel();
-
-      event_({type: "drag", x: p[0] + offset[0], y: p[1] + offset[1], dx: dx, dy: dy});
-    }
-
-    function dragend() {
-      event_({type: "dragend"});
-
-      // if moved, prevent the mouseup (and possibly click) from propagating
-      if (moved) {
-        d3_eventCancel();
-        if (d3.event.target === eventTarget) w.on("click.drag", click, true);
-      }
-
-      w .on("mousemove.drag", null)
-        .on("touchmove.drag", null)
-        .on("mouseup.drag", null)
-        .on("touchend.drag", null);
-    }
-
-    // prevent the subsequent click from propagating (e.g., for anchors)
-    function click() {
-      d3_eventCancel();
-      w.on("click.drag", null);
-    }
-  }
-
-  drag.origin = function(x) {
-    if (!arguments.length) return origin;
-    origin = x;
-    return drag;
-  };
-
-  return d3.rebind(drag, event, "on");
-};
-d3.behavior.zoom = function() {
-  var translate = [0, 0],
-      translate0, // translate when we started zooming (to avoid drift)
-      scale = 1,
-      scale0, // scale when we started touching
-      scaleExtent = d3_behavior_zoomInfinity,
-      event = d3_eventDispatch(zoom, "zoom"),
-      x0,
-      x1,
-      y0,
-      y1,
-      touchtime; // time of last touchstart (to detect double-tap)
-
-  function zoom() {
-    this
-        .on("mousedown.zoom", mousedown)
-        .on("mousewheel.zoom", mousewheel)
-        .on("mousemove.zoom", mousemove)
-        .on("DOMMouseScroll.zoom", mousewheel)
-        .on("dblclick.zoom", dblclick)
-        .on("touchstart.zoom", touchstart)
-        .on("touchmove.zoom", touchmove)
-        .on("touchend.zoom", touchstart);
-  }
-
-  zoom.translate = function(x) {
-    if (!arguments.length) return translate;
-    translate = x.map(Number);
-    return zoom;
-  };
-
-  zoom.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = +x;
-    return zoom;
-  };
-
-  zoom.scaleExtent = function(x) {
-    if (!arguments.length) return scaleExtent;
-    scaleExtent = x == null ? d3_behavior_zoomInfinity : x.map(Number);
-    return zoom;
-  };
-
-  zoom.x = function(z) {
-    if (!arguments.length) return x1;
-    x1 = z;
-    x0 = z.copy();
-    return zoom;
-  };
-
-  zoom.y = function(z) {
-    if (!arguments.length) return y1;
-    y1 = z;
-    y0 = z.copy();
-    return zoom;
-  };
-
-  function location(p) {
-    return [(p[0] - translate[0]) / scale, (p[1] - translate[1]) / scale];
-  }
-
-  function point(l) {
-    return [l[0] * scale + translate[0], l[1] * scale + translate[1]];
-  }
-
-  function scaleTo(s) {
-    scale = Math.max(scaleExtent[0], Math.min(scaleExtent[1], s));
-  }
-
-  function translateTo(p, l) {
-    l = point(l);
-    translate[0] += p[0] - l[0];
-    translate[1] += p[1] - l[1];
-  }
-
-  function dispatch(event) {
-    if (x1) x1.domain(x0.range().map(function(x) { return (x - translate[0]) / scale; }).map(x0.invert));
-    if (y1) y1.domain(y0.range().map(function(y) { return (y - translate[1]) / scale; }).map(y0.invert));
-    d3.event.preventDefault();
-    event({type: "zoom", scale: scale, translate: translate});
-  }
-
-  function mousedown() {
-    var target = this,
-        event_ = event.of(target, arguments),
-        eventTarget = d3.event.target,
-        moved = 0,
-        w = d3.select(window).on("mousemove.zoom", mousemove).on("mouseup.zoom", mouseup),
-        l = location(d3.mouse(target));
-
-    window.focus();
-    d3_eventCancel();
-
-    function mousemove() {
-      moved = 1;
-      translateTo(d3.mouse(target), l);
-      dispatch(event_);
-    }
-
-    function mouseup() {
-      if (moved) d3_eventCancel();
-      w.on("mousemove.zoom", null).on("mouseup.zoom", null);
-      if (moved && d3.event.target === eventTarget) w.on("click.zoom", click);
-    }
-
-    function click() {
-      d3_eventCancel();
-      w.on("click.zoom", null);
-    }
-  }
-
-  function mousewheel() {
-    if (!translate0) translate0 = location(d3.mouse(this));
-    scaleTo(Math.pow(2, d3_behavior_zoomDelta() * .002) * scale);
-    translateTo(d3.mouse(this), translate0);
-    dispatch(event.of(this, arguments));
-  }
-
-  function mousemove() {
-    translate0 = null;
-  }
-
-  function dblclick() {
-    var p = d3.mouse(this), l = location(p);
-    scaleTo(d3.event.shiftKey ? scale / 2 : scale * 2);
-    translateTo(p, l);
-    dispatch(event.of(this, arguments));
-  }
-
-  function touchstart() {
-    var touches = d3.touches(this),
-        now = Date.now();
-
-    scale0 = scale;
-    translate0 = {};
-    touches.forEach(function(t) { translate0[t.identifier] = location(t); });
-    d3_eventCancel();
-
-    if ((touches.length === 1) && (now - touchtime < 500)) { // dbltap
-      var p = touches[0], l = location(touches[0]);
-      scaleTo(scale * 2);
-      translateTo(p, l);
-      dispatch(event.of(this, arguments));
-    }
-    touchtime = now;
-  }
-
-  function touchmove() {
-    var touches = d3.touches(this),
-        p0 = touches[0],
-        l0 = translate0[p0.identifier];
-    if (p1 = touches[1]) {
-      var p1, l1 = translate0[p1.identifier];
-      p0 = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
-      l0 = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
-      scaleTo(d3.event.scale * scale0);
-    }
-    translateTo(p0, l0);
-    dispatch(event.of(this, arguments));
-  }
-
-  return d3.rebind(zoom, event, "on");
-};
-
-var d3_behavior_zoomDiv, // for interpreting mousewheel events
-    d3_behavior_zoomInfinity = [0, Infinity]; // default scale extent
-
-function d3_behavior_zoomDelta() {
-
-  // mousewheel events are totally broken!
-  // https://bugs.webkit.org/show_bug.cgi?id=40441
-  // not only that, but Chrome and Safari differ in re. to acceleration!
-  if (!d3_behavior_zoomDiv) {
-    d3_behavior_zoomDiv = d3.select("body").append("div")
-        .style("visibility", "hidden")
-        .style("top", 0)
-        .style("height", 0)
-        .style("width", 0)
-        .style("overflow-y", "scroll")
-      .append("div")
-        .style("height", "2000px")
-      .node().parentNode;
-  }
-
-  var e = d3.event, delta;
-  try {
-    d3_behavior_zoomDiv.scrollTop = 1000;
-    d3_behavior_zoomDiv.dispatchEvent(e);
-    delta = 1000 - d3_behavior_zoomDiv.scrollTop;
-  } catch (error) {
-    delta = e.wheelDelta || (-e.detail * 5);
-  }
-
-  return delta;
-}
-d3.layout = {};
-// Implements hierarchical edge bundling using Holten's algorithm. For each
-// input link, a path is computed that travels through the tree, up the parent
-// hierarchy to the least common ancestor, and then back down to the destination
-// node. Each path is simply an array of nodes.
-d3.layout.bundle = function() {
-  return function(links) {
-    var paths = [],
-        i = -1,
-        n = links.length;
-    while (++i < n) paths.push(d3_layout_bundlePath(links[i]));
-    return paths;
-  };
-};
-
-function d3_layout_bundlePath(link) {
-  var start = link.source,
-      end = link.target,
-      lca = d3_layout_bundleLeastCommonAncestor(start, end),
-      points = [start];
-  while (start !== lca) {
-    start = start.parent;
-    points.push(start);
-  }
-  var k = points.length;
-  while (end !== lca) {
-    points.splice(k, 0, end);
-    end = end.parent;
-  }
-  return points;
-}
-
-function d3_layout_bundleAncestors(node) {
-  var ancestors = [],
-      parent = node.parent;
-  while (parent != null) {
-    ancestors.push(node);
-    node = parent;
-    parent = parent.parent;
-  }
-  ancestors.push(node);
-  return ancestors;
-}
-
-function d3_layout_bundleLeastCommonAncestor(a, b) {
-  if (a === b) return a;
-  var aNodes = d3_layout_bundleAncestors(a),
-      bNodes = d3_layout_bundleAncestors(b),
-      aNode = aNodes.pop(),
-      bNode = bNodes.pop(),
-      sharedNode = null;
-  while (aNode === bNode) {
-    sharedNode = aNode;
-    aNode = aNodes.pop();
-    bNode = bNodes.pop();
-  }
-  return sharedNode;
-}
-d3.layout.chord = function() {
-  var chord = {},
-      chords,
-      groups,
-      matrix,
-      n,
-      padding = 0,
-      sortGroups,
-      sortSubgroups,
-      sortChords;
-
-  function relayout() {
-    var subgroups = {},
-        groupSums = [],
-        groupIndex = d3.range(n),
-        subgroupIndex = [],
-        k,
-        x,
-        x0,
-        i,
-        j;
-
-    chords = [];
-    groups = [];
-
-    // Compute the sum.
-    k = 0, i = -1; while (++i < n) {
-      x = 0, j = -1; while (++j < n) {
-        x += matrix[i][j];
-      }
-      groupSums.push(x);
-      subgroupIndex.push(d3.range(n));
-      k += x;
-    }
-
-    // Sort groups…
-    if (sortGroups) {
-      groupIndex.sort(function(a, b) {
-        return sortGroups(groupSums[a], groupSums[b]);
-      });
-    }
-
-    // Sort subgroups…
-    if (sortSubgroups) {
-      subgroupIndex.forEach(function(d, i) {
-        d.sort(function(a, b) {
-          return sortSubgroups(matrix[i][a], matrix[i][b]);
-        });
-      });
-    }
-
-    // Convert the sum to scaling factor for [0, 2pi].
-    // TODO Allow start and end angle to be specified.
-    // TODO Allow padding to be specified as percentage?
-    k = (2 * Math.PI - padding * n) / k;
-
-    // Compute the start and end angle for each group and subgroup.
-    // Note: Opera has a bug reordering object literal properties!
-    x = 0, i = -1; while (++i < n) {
-      x0 = x, j = -1; while (++j < n) {
-        var di = groupIndex[i],
-            dj = subgroupIndex[di][j],
-            v = matrix[di][dj],
-            a0 = x,
-            a1 = x += v * k;
-        subgroups[di + "-" + dj] = {
-          index: di,
-          subindex: dj,
-          startAngle: a0,
-          endAngle: a1,
-          value: v
-        };
-      }
-      groups.push({
-        index: di,
-        startAngle: x0,
-        endAngle: x,
-        value: (x - x0) / k
-      });
-      x += padding;
-    }
-
-    // Generate chords for each (non-empty) subgroup-subgroup link.
-    i = -1; while (++i < n) {
-      j = i - 1; while (++j < n) {
-        var source = subgroups[i + "-" + j],
-            target = subgroups[j + "-" + i];
-        if (source.value || target.value) {
-          chords.push(source.value < target.value
-              ? {source: target, target: source}
-              : {source: source, target: target});
-        }
-      }
-    }
-
-    if (sortChords) resort();
-  }
-
-  function resort() {
-    chords.sort(function(a, b) {
-      return sortChords(
-          (a.source.value + a.target.value) / 2,
-          (b.source.value + b.target.value) / 2);
-    });
-  }
-
-  chord.matrix = function(x) {
-    if (!arguments.length) return matrix;
-    n = (matrix = x) && matrix.length;
-    chords = groups = null;
-    return chord;
-  };
-
-  chord.padding = function(x) {
-    if (!arguments.length) return padding;
-    padding = x;
-    chords = groups = null;
-    return chord;
-  };
-
-  chord.sortGroups = function(x) {
-    if (!arguments.length) return sortGroups;
-    sortGroups = x;
-    chords = groups = null;
-    return chord;
-  };
-
-  chord.sortSubgroups = function(x) {
-    if (!arguments.length) return sortSubgroups;
-    sortSubgroups = x;
-    chords = null;
-    return chord;
-  };
-
-  chord.sortChords = function(x) {
-    if (!arguments.length) return sortChords;
-    sortChords = x;
-    if (chords) resort();
-    return chord;
-  };
-
-  chord.chords = function() {
-    if (!chords) relayout();
-    return chords;
-  };
-
-  chord.groups = function() {
-    if (!groups) relayout();
-    return groups;
-  };
-
-  return chord;
-};
-// A rudimentary force layout using Gauss-Seidel.
-d3.layout.force = function() {
-  var force = {},
-      event = d3.dispatch("start", "tick", "end"),
-      size = [1, 1],
-      drag,
-      alpha,
-      friction = .9,
-      linkDistance = d3_layout_forceLinkDistance,
-      linkStrength = d3_layout_forceLinkStrength,
-      charge = -30,
-      gravity = .1,
-      theta = .8,
-      interval,
-      nodes = [],
-      links = [],
-      distances,
-      strengths,
-      charges;
-
-  function repulse(node) {
-    return function(quad, x1, y1, x2, y2) {
-      if (quad.point !== node) {
-        var dx = quad.cx - node.x,
-            dy = quad.cy - node.y,
-            dn = 1 / Math.sqrt(dx * dx + dy * dy);
-
-        /* Barnes-Hut criterion. */
-        if ((x2 - x1) * dn < theta) {
-          var k = quad.charge * dn * dn;
-          node.px -= dx * k;
-          node.py -= dy * k;
-          return true;
-        }
-
-        if (quad.point && isFinite(dn)) {
-          var k = quad.pointCharge * dn * dn;
-          node.px -= dx * k;
-          node.py -= dy * k;
-        }
-      }
-      return !quad.charge;
-    };
-  }
-
-  force.tick = function() {
-    // simulated annealing, basically
-    if ((alpha *= .99) < .005) {
-      event.end({type: "end", alpha: alpha = 0});
-      return true;
-    }
-
-    var n = nodes.length,
-        m = links.length,
-        q,
-        i, // current index
-        o, // current object
-        s, // current source
-        t, // current target
-        l, // current distance
-        k, // current force
-        x, // x-distance
-        y; // y-distance
-
-    // gauss-seidel relaxation for links
-    for (i = 0; i < m; ++i) {
-      o = links[i];
-      s = o.source;
-      t = o.target;
-      x = t.x - s.x;
-      y = t.y - s.y;
-      if (l = (x * x + y * y)) {
-        l = alpha * strengths[i] * ((l = Math.sqrt(l)) - distances[i]) / l;
-        x *= l;
-        y *= l;
-        t.x -= x * (k = s.weight / (t.weight + s.weight));
-        t.y -= y * k;
-        s.x += x * (k = 1 - k);
-        s.y += y * k;
-      }
-    }
-
-    // apply gravity forces
-    if (k = alpha * gravity) {
-      x = size[0] / 2;
-      y = size[1] / 2;
-      i = -1; if (k) while (++i < n) {
-        o = nodes[i];
-        o.x += (x - o.x) * k;
-        o.y += (y - o.y) * k;
-      }
-    }
-
-    // compute quadtree center of mass and apply charge forces
-    if (charge) {
-      d3_layout_forceAccumulate(q = d3.geom.quadtree(nodes), alpha, charges);
-      i = -1; while (++i < n) {
-        if (!(o = nodes[i]).fixed) {
-          q.visit(repulse(o));
-        }
-      }
-    }
-
-    // position verlet integration
-    i = -1; while (++i < n) {
-      o = nodes[i];
-      if (o.fixed) {
-        o.x = o.px;
-        o.y = o.py;
-      } else {
-        o.x -= (o.px - (o.px = o.x)) * friction;
-        o.y -= (o.py - (o.py = o.y)) * friction;
-      }
-    }
-
-    event.tick({type: "tick", alpha: alpha});
-  };
-
-  force.nodes = function(x) {
-    if (!arguments.length) return nodes;
-    nodes = x;
-    return force;
-  };
-
-  force.links = function(x) {
-    if (!arguments.length) return links;
-    links = x;
-    return force;
-  };
-
-  force.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return force;
-  };
-
-  force.linkDistance = function(x) {
-    if (!arguments.length) return linkDistance;
-    linkDistance = d3.functor(x);
-    return force;
-  };
-
-  // For backwards-compatibility.
-  force.distance = force.linkDistance;
-
-  force.linkStrength = function(x) {
-    if (!arguments.length) return linkStrength;
-    linkStrength = d3.functor(x);
-    return force;
-  };
-
-  force.friction = function(x) {
-    if (!arguments.length) return friction;
-    friction = x;
-    return force;
-  };
-
-  force.charge = function(x) {
-    if (!arguments.length) return charge;
-    charge = typeof x === "function" ? x : +x;
-    return force;
-  };
-
-  force.gravity = function(x) {
-    if (!arguments.length) return gravity;
-    gravity = x;
-    return force;
-  };
-
-  force.theta = function(x) {
-    if (!arguments.length) return theta;
-    theta = x;
-    return force;
-  };
-
-  force.alpha = function(x) {
-    if (!arguments.length) return alpha;
-
-    if (alpha) { // if we're already running
-      if (x > 0) alpha = x; // we might keep it hot
-      else alpha = 0; // or, next tick will dispatch "end"
-    } else if (x > 0) { // otherwise, fire it up!
-      event.start({type: "start", alpha: alpha = x});
-      d3.timer(force.tick);
-    }
-
-    return force;
-  };
-
-  force.start = function() {
-    var i,
-        j,
-        n = nodes.length,
-        m = links.length,
-        w = size[0],
-        h = size[1],
-        neighbors,
-        o;
-
-    for (i = 0; i < n; ++i) {
-      (o = nodes[i]).index = i;
-      o.weight = 0;
-    }
-
-    distances = [];
-    strengths = [];
-    for (i = 0; i < m; ++i) {
-      o = links[i];
-      if (typeof o.source == "number") o.source = nodes[o.source];
-      if (typeof o.target == "number") o.target = nodes[o.target];
-      distances[i] = linkDistance.call(this, o, i);
-      strengths[i] = linkStrength.call(this, o, i);
-      ++o.source.weight;
-      ++o.target.weight;
-    }
-
-    for (i = 0; i < n; ++i) {
-      o = nodes[i];
-      if (isNaN(o.x)) o.x = position("x", w);
-      if (isNaN(o.y)) o.y = position("y", h);
-      if (isNaN(o.px)) o.px = o.x;
-      if (isNaN(o.py)) o.py = o.y;
-    }
-
-    charges = [];
-    if (typeof charge === "function") {
-      for (i = 0; i < n; ++i) {
-        charges[i] = +charge.call(this, nodes[i], i);
-      }
-    } else {
-      for (i = 0; i < n; ++i) {
-        charges[i] = charge;
-      }
-    }
-
-    // initialize node position based on first neighbor
-    function position(dimension, size) {
-      var neighbors = neighbor(i),
-          j = -1,
-          m = neighbors.length,
-          x;
-      while (++j < m) if (!isNaN(x = neighbors[j][dimension])) return x;
-      return Math.random() * size;
-    }
-
-    // initialize neighbors lazily
-    function neighbor() {
-      if (!neighbors) {
-        neighbors = [];
-        for (j = 0; j < n; ++j) {
-          neighbors[j] = [];
-        }
-        for (j = 0; j < m; ++j) {
-          var o = links[j];
-          neighbors[o.source.index].push(o.target);
-          neighbors[o.target.index].push(o.source);
-        }
-      }
-      return neighbors[i];
-    }
-
-    return force.resume();
-  };
-
-  force.resume = function() {
-    return force.alpha(.1);
-  };
-
-  force.stop = function() {
-    return force.alpha(0);
-  };
-
-  // use `node.call(force.drag)` to make nodes draggable
-  force.drag = function() {
-    if (!drag) drag = d3.behavior.drag()
-        .origin(Object)
-        .on("dragstart", dragstart)
-        .on("drag", d3_layout_forceDrag)
-        .on("dragend", d3_layout_forceDragEnd);
-
-    this.on("mouseover.force", d3_layout_forceDragOver)
-        .on("mouseout.force", d3_layout_forceDragOut)
-        .call(drag);
-  };
-
-  function dragstart(d) {
-    d3_layout_forceDragOver(d3_layout_forceDragNode = d);
-    d3_layout_forceDragForce = force;
-  }
-
-  return d3.rebind(force, event, "on");
-};
-
-var d3_layout_forceDragForce,
-    d3_layout_forceDragNode;
-
-function d3_layout_forceDragOver(d) {
-  d.fixed |= 2;
-}
-
-function d3_layout_forceDragOut(d) {
-  if (d !== d3_layout_forceDragNode) d.fixed &= 1;
-}
-
-function d3_layout_forceDragEnd() {
-  d3_layout_forceDragNode.fixed &= 1;
-  d3_layout_forceDragForce = d3_layout_forceDragNode = null;
-}
-
-function d3_layout_forceDrag() {
-  d3_layout_forceDragNode.px = d3.event.x;
-  d3_layout_forceDragNode.py = d3.event.y;
-  d3_layout_forceDragForce.resume(); // restart annealing
-}
-
-function d3_layout_forceAccumulate(quad, alpha, charges) {
-  var cx = 0,
-      cy = 0;
-  quad.charge = 0;
-  if (!quad.leaf) {
-    var nodes = quad.nodes,
-        n = nodes.length,
-        i = -1,
-        c;
-    while (++i < n) {
-      c = nodes[i];
-      if (c == null) continue;
-      d3_layout_forceAccumulate(c, alpha, charges);
-      quad.charge += c.charge;
-      cx += c.charge * c.cx;
-      cy += c.charge * c.cy;
-    }
-  }
-  if (quad.point) {
-    // jitter internal nodes that are coincident
-    if (!quad.leaf) {
-      quad.point.x += Math.random() - .5;
-      quad.point.y += Math.random() - .5;
-    }
-    var k = alpha * charges[quad.point.index];
-    quad.charge += quad.pointCharge = k;
-    cx += k * quad.point.x;
-    cy += k * quad.point.y;
-  }
-  quad.cx = cx / quad.charge;
-  quad.cy = cy / quad.charge;
-}
-
-function d3_layout_forceLinkDistance(link) {
-  return 20;
-}
-
-function d3_layout_forceLinkStrength(link) {
-  return 1;
-}
-d3.layout.partition = function() {
-  var hierarchy = d3.layout.hierarchy(),
-      size = [1, 1]; // width, height
-
-  function position(node, x, dx, dy) {
-    var children = node.children;
-    node.x = x;
-    node.y = node.depth * dy;
-    node.dx = dx;
-    node.dy = dy;
-    if (children && (n = children.length)) {
-      var i = -1,
-          n,
-          c,
-          d;
-      dx = node.value ? dx / node.value : 0;
-      while (++i < n) {
-        position(c = children[i], x, d = c.value * dx, dy);
-        x += d;
-      }
-    }
-  }
-
-  function depth(node) {
-    var children = node.children,
-        d = 0;
-    if (children && (n = children.length)) {
-      var i = -1,
-          n;
-      while (++i < n) d = Math.max(d, depth(children[i]));
-    }
-    return 1 + d;
-  }
-
-  function partition(d, i) {
-    var nodes = hierarchy.call(this, d, i);
-    position(nodes[0], 0, size[0], size[1] / depth(nodes[0]));
-    return nodes;
-  }
-
-  partition.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return partition;
-  };
-
-  return d3_layout_hierarchyRebind(partition, hierarchy);
-};
-d3.layout.pie = function() {
-  var value = Number,
-      sort = d3_layout_pieSortByValue,
-      startAngle = 0,
-      endAngle = 2 * Math.PI;
-
-  function pie(data, i) {
-
-    // Compute the numeric values for each data element.
-    var values = data.map(function(d, i) { return +value.call(pie, d, i); });
-
-    // Compute the start angle.
-    var a = +(typeof startAngle === "function"
-        ? startAngle.apply(this, arguments)
-        : startAngle);
-
-    // Compute the angular scale factor: from value to radians.
-    var k = ((typeof endAngle === "function"
-        ? endAngle.apply(this, arguments)
-        : endAngle) - startAngle)
-        / d3.sum(values);
-
-    // Optionally sort the data.
-    var index = d3.range(data.length);
-    if (sort != null) index.sort(sort === d3_layout_pieSortByValue
-        ? function(i, j) { return values[j] - values[i]; }
-        : function(i, j) { return sort(data[i], data[j]); });
-
-    // Compute the arcs!
-    // They are stored in the original data's order.
-    var arcs = [];
-    index.forEach(function(i) {
-      arcs[i] = {
-        data: data[i],
-        value: d = values[i],
-        startAngle: a,
-        endAngle: a += d * k
-      };
-    });
-    return arcs;
-  }
-
-  /**
-   * Specifies the value function *x*, which returns a nonnegative numeric value
-   * for each datum. The default value function is `Number`. The value function
-   * is passed two arguments: the current datum and the current index.
-   */
-  pie.value = function(x) {
-    if (!arguments.length) return value;
-    value = x;
-    return pie;
-  };
-
-  /**
-   * Specifies a sort comparison operator *x*. The comparator is passed two data
-   * elements from the data array, a and b; it returns a negative value if a is
-   * less than b, a positive value if a is greater than b, and zero if a equals
-   * b.
-   */
-  pie.sort = function(x) {
-    if (!arguments.length) return sort;
-    sort = x;
-    return pie;
-  };
-
-  /**
-   * Specifies the overall start angle of the pie chart. Defaults to 0. The
-   * start angle can be specified either as a constant or as a function; in the
-   * case of a function, it is evaluated once per array (as opposed to per
-   * element).
-   */
-  pie.startAngle = function(x) {
-    if (!arguments.length) return startAngle;
-    startAngle = x;
-    return pie;
-  };
-
-  /**
-   * Specifies the overall end angle of the pie chart. Defaults to 2π. The
-   * end angle can be specified either as a constant or as a function; in the
-   * case of a function, it is evaluated once per array (as opposed to per
-   * element).
-   */
-  pie.endAngle = function(x) {
-    if (!arguments.length) return endAngle;
-    endAngle = x;
-    return pie;
-  };
-
-  return pie;
-};
-
-var d3_layout_pieSortByValue = {};
-// data is two-dimensional array of x,y; we populate y0
-d3.layout.stack = function() {
-  var values = Object,
-      order = d3_layout_stackOrderDefault,
-      offset = d3_layout_stackOffsetZero,
-      out = d3_layout_stackOut,
-      x = d3_layout_stackX,
-      y = d3_layout_stackY;
-
-  function stack(data, index) {
-
-    // Convert series to canonical two-dimensional representation.
-    var series = data.map(function(d, i) {
-      return values.call(stack, d, i);
-    });
-
-    // Convert each series to canonical [[x,y]] representation.
-    var points = series.map(function(d, i) {
-      return d.map(function(v, i) {
-        return [x.call(stack, v, i), y.call(stack, v, i)];
-      });
-    });
-
-    // Compute the order of series, and permute them.
-    var orders = order.call(stack, points, index);
-    series = d3.permute(series, orders);
-    points = d3.permute(points, orders);
-
-    // Compute the baseline…
-    var offsets = offset.call(stack, points, index);
-
-    // And propagate it to other series.
-    var n = series.length,
-        m = series[0].length,
-        i,
-        j,
-        o;
-    for (j = 0; j < m; ++j) {
-      out.call(stack, series[0][j], o = offsets[j], points[0][j][1]);
-      for (i = 1; i < n; ++i) {
-        out.call(stack, series[i][j], o += points[i - 1][j][1], points[i][j][1]);
-      }
-    }
-
-    return data;
-  }
-
-  stack.values = function(x) {
-    if (!arguments.length) return values;
-    values = x;
-    return stack;
-  };
-
-  stack.order = function(x) {
-    if (!arguments.length) return order;
-    order = typeof x === "function" ? x : d3_layout_stackOrders.get(x) || d3_layout_stackOrderDefault;
-    return stack;
-  };
-
-  stack.offset = function(x) {
-    if (!arguments.length) return offset;
-    offset = typeof x === "function" ? x : d3_layout_stackOffsets.get(x) || d3_layout_stackOffsetZero;
-    return stack;
-  };
-
-  stack.x = function(z) {
-    if (!arguments.length) return x;
-    x = z;
-    return stack;
-  };
-
-  stack.y = function(z) {
-    if (!arguments.length) return y;
-    y = z;
-    return stack;
-  };
-
-  stack.out = function(z) {
-    if (!arguments.length) return out;
-    out = z;
-    return stack;
-  };
-
-  return stack;
-}
-
-function d3_layout_stackX(d) {
-  return d.x;
-}
-
-function d3_layout_stackY(d) {
-  return d.y;
-}
-
-function d3_layout_stackOut(d, y0, y) {
-  d.y0 = y0;
-  d.y = y;
-}
-
-var d3_layout_stackOrders = d3.map({
-
-  "inside-out": function(data) {
-    var n = data.length,
-        i,
-        j,
-        max = data.map(d3_layout_stackMaxIndex),
-        sums = data.map(d3_layout_stackReduceSum),
-        index = d3.range(n).sort(function(a, b) { return max[a] - max[b]; }),
-        top = 0,
-        bottom = 0,
-        tops = [],
-        bottoms = [];
-    for (i = 0; i < n; ++i) {
-      j = index[i];
-      if (top < bottom) {
-        top += sums[j];
-        tops.push(j);
-      } else {
-        bottom += sums[j];
-        bottoms.push(j);
-      }
-    }
-    return bottoms.reverse().concat(tops);
-  },
-
-  "reverse": function(data) {
-    return d3.range(data.length).reverse();
-  },
-
-  "default": d3_layout_stackOrderDefault
-
-});
-
-var d3_layout_stackOffsets = d3.map({
-
-  "silhouette": function(data) {
-    var n = data.length,
-        m = data[0].length,
-        sums = [],
-        max = 0,
-        i,
-        j,
-        o,
-        y0 = [];
-    for (j = 0; j < m; ++j) {
-      for (i = 0, o = 0; i < n; i++) o += data[i][j][1];
-      if (o > max) max = o;
-      sums.push(o);
-    }
-    for (j = 0; j < m; ++j) {
-      y0[j] = (max - sums[j]) / 2;
-    }
-    return y0;
-  },
-
-  "wiggle": function(data) {
-    var n = data.length,
-        x = data[0],
-        m = x.length,
-        max = 0,
-        i,
-        j,
-        k,
-        s1,
-        s2,
-        s3,
-        dx,
-        o,
-        o0,
-        y0 = [];
-    y0[0] = o = o0 = 0;
-    for (j = 1; j < m; ++j) {
-      for (i = 0, s1 = 0; i < n; ++i) s1 += data[i][j][1];
-      for (i = 0, s2 = 0, dx = x[j][0] - x[j - 1][0]; i < n; ++i) {
-        for (k = 0, s3 = (data[i][j][1] - data[i][j - 1][1]) / (2 * dx); k < i; ++k) {
-          s3 += (data[k][j][1] - data[k][j - 1][1]) / dx;
-        }
-        s2 += s3 * data[i][j][1];
-      }
-      y0[j] = o -= s1 ? s2 / s1 * dx : 0;
-      if (o < o0) o0 = o;
-    }
-    for (j = 0; j < m; ++j) y0[j] -= o0;
-    return y0;
-  },
-
-  "expand": function(data) {
-    var n = data.length,
-        m = data[0].length,
-        k = 1 / n,
-        i,
-        j,
-        o,
-        y0 = [];
-    for (j = 0; j < m; ++j) {
-      for (i = 0, o = 0; i < n; i++) o += data[i][j][1];
-      if (o) for (i = 0; i < n; i++) data[i][j][1] /= o;
-      else for (i = 0; i < n; i++) data[i][j][1] = k;
-    }
-    for (j = 0; j < m; ++j) y0[j] = 0;
-    return y0;
-  },
-
-  "zero": d3_layout_stackOffsetZero
-
-});
-
-function d3_layout_stackOrderDefault(data) {
-  return d3.range(data.length);
-}
-
-function d3_layout_stackOffsetZero(data) {
-  var j = -1,
-      m = data[0].length,
-      y0 = [];
-  while (++j < m) y0[j] = 0;
-  return y0;
-}
-
-function d3_layout_stackMaxIndex(array) {
-  var i = 1,
-      j = 0,
-      v = array[0][1],
-      k,
-      n = array.length;
-  for (; i < n; ++i) {
-    if ((k = array[i][1]) > v) {
-      j = i;
-      v = k;
-    }
-  }
-  return j;
-}
-
-function d3_layout_stackReduceSum(d) {
-  return d.reduce(d3_layout_stackSum, 0);
-}
-
-function d3_layout_stackSum(p, d) {
-  return p + d[1];
-}
-d3.layout.histogram = function() {
-  var frequency = true,
-      valuer = Number,
-      ranger = d3_layout_histogramRange,
-      binner = d3_layout_histogramBinSturges;
-
-  function histogram(data, i) {
-    var bins = [],
-        values = data.map(valuer, this),
-        range = ranger.call(this, values, i),
-        thresholds = binner.call(this, range, values, i),
-        bin,
-        i = -1,
-        n = values.length,
-        m = thresholds.length - 1,
-        k = frequency ? 1 : 1 / n,
-        x;
-
-    // Initialize the bins.
-    while (++i < m) {
-      bin = bins[i] = [];
-      bin.dx = thresholds[i + 1] - (bin.x = thresholds[i]);
-      bin.y = 0;
-    }
-
-    // Fill the bins, ignoring values outside the range.
-    i = -1; while(++i < n) {
-      x = values[i];
-      if ((x >= range[0]) && (x <= range[1])) {
-        bin = bins[d3.bisect(thresholds, x, 1, m) - 1];
-        bin.y += k;
-        bin.push(data[i]);
-      }
-    }
-
-    return bins;
-  }
-
-  // Specifies how to extract a value from the associated data. The default
-  // value function is `Number`, which is equivalent to the identity function.
-  histogram.value = function(x) {
-    if (!arguments.length) return valuer;
-    valuer = x;
-    return histogram;
-  };
-
-  // Specifies the range of the histogram. Values outside the specified range
-  // will be ignored. The argument `x` may be specified either as a two-element
-  // array representing the minimum and maximum value of the range, or as a
-  // function that returns the range given the array of values and the current
-  // index `i`. The default range is the extent (minimum and maximum) of the
-  // values.
-  histogram.range = function(x) {
-    if (!arguments.length) return ranger;
-    ranger = d3.functor(x);
-    return histogram;
-  };
-
-  // Specifies how to bin values in the histogram. The argument `x` may be
-  // specified as a number, in which case the range of values will be split
-  // uniformly into the given number of bins. Or, `x` may be an array of
-  // threshold values, defining the bins; the specified array must contain the
-  // rightmost (upper) value, thus specifying n + 1 values for n bins. Or, `x`
-  // may be a function which is evaluated, being passed the range, the array of
-  // values, and the current index `i`, returning an array of thresholds. The
-  // default bin function will divide the values into uniform bins using
-  // Sturges' formula.
-  histogram.bins = function(x) {
-    if (!arguments.length) return binner;
-    binner = typeof x === "number"
-        ? function(range) { return d3_layout_histogramBinFixed(range, x); }
-        : d3.functor(x);
-    return histogram;
-  };
-
-  // Specifies whether the histogram's `y` value is a count (frequency) or a
-  // probability (density). The default value is true.
-  histogram.frequency = function(x) {
-    if (!arguments.length) return frequency;
-    frequency = !!x;
-    return histogram;
-  };
-
-  return histogram;
-};
-
-function d3_layout_histogramBinSturges(range, values) {
-  return d3_layout_histogramBinFixed(range, Math.ceil(Math.log(values.length) / Math.LN2 + 1));
-}
-
-function d3_layout_histogramBinFixed(range, n) {
-  var x = -1,
-      b = +range[0],
-      m = (range[1] - b) / n,
-      f = [];
-  while (++x <= n) f[x] = m * x + b;
-  return f;
-}
-
-function d3_layout_histogramRange(values) {
-  return [d3.min(values), d3.max(values)];
-}
-d3.layout.hierarchy = function() {
-  var sort = d3_layout_hierarchySort,
-      children = d3_layout_hierarchyChildren,
-      value = d3_layout_hierarchyValue;
-
-  // Recursively compute the node depth and value.
-  // Also converts the data representation into a standard hierarchy structure.
-  function recurse(data, depth, nodes) {
-    var childs = children.call(hierarchy, data, depth),
-        node = d3_layout_hierarchyInline ? data : {data: data};
-    node.depth = depth;
-    nodes.push(node);
-    if (childs && (n = childs.length)) {
-      var i = -1,
-          n,
-          c = node.children = [],
-          v = 0,
-          j = depth + 1;
-      while (++i < n) {
-        d = recurse(childs[i], j, nodes);
-        d.parent = node;
-        c.push(d);
-        v += d.value;
-      }
-      if (sort) c.sort(sort);
-      if (value) node.value = v;
-    } else if (value) {
-      node.value = +value.call(hierarchy, data, depth) || 0;
-    }
-    return node;
-  }
-
-  // Recursively re-evaluates the node value.
-  function revalue(node, depth) {
-    var children = node.children,
-        v = 0;
-    if (children && (n = children.length)) {
-      var i = -1,
-          n,
-          j = depth + 1;
-      while (++i < n) v += revalue(children[i], j);
-    } else if (value) {
-      v = +value.call(hierarchy, d3_layout_hierarchyInline ? node : node.data, depth) || 0;
-    }
-    if (value) node.value = v;
-    return v;
-  }
-
-  function hierarchy(d) {
-    var nodes = [];
-    recurse(d, 0, nodes);
-    return nodes;
-  }
-
-  hierarchy.sort = function(x) {
-    if (!arguments.length) return sort;
-    sort = x;
-    return hierarchy;
-  };
-
-  hierarchy.children = function(x) {
-    if (!arguments.length) return children;
-    children = x;
-    return hierarchy;
-  };
-
-  hierarchy.value = function(x) {
-    if (!arguments.length) return value;
-    value = x;
-    return hierarchy;
-  };
-
-  // Re-evaluates the `value` property for the specified hierarchy.
-  hierarchy.revalue = function(root) {
-    revalue(root, 0);
-    return root;
-  };
-
-  return hierarchy;
-};
-
-// A method assignment helper for hierarchy subclasses.
-function d3_layout_hierarchyRebind(object, hierarchy) {
-  d3.rebind(object, hierarchy, "sort", "children", "value");
-
-  // Add an alias for links, for convenience.
-  object.links = d3_layout_hierarchyLinks;
-
-  // If the new API is used, enabling inlining.
-  object.nodes = function(d) {
-    d3_layout_hierarchyInline = true;
-    return (object.nodes = object)(d);
-  };
-
-  return object;
-}
-
-function d3_layout_hierarchyChildren(d) {
-  return d.children;
-}
-
-function d3_layout_hierarchyValue(d) {
-  return d.value;
-}
-
-function d3_layout_hierarchySort(a, b) {
-  return b.value - a.value;
-}
-
-// Returns an array source+target objects for the specified nodes.
-function d3_layout_hierarchyLinks(nodes) {
-  return d3.merge(nodes.map(function(parent) {
-    return (parent.children || []).map(function(child) {
-      return {source: parent, target: child};
-    });
-  }));
-}
-
-// For backwards-compatibility, don't enable inlining by default.
-var d3_layout_hierarchyInline = false;
-d3.layout.pack = function() {
-  var hierarchy = d3.layout.hierarchy().sort(d3_layout_packSort),
-      size = [1, 1];
-
-  function pack(d, i) {
-    var nodes = hierarchy.call(this, d, i),
-        root = nodes[0];
-
-    // Recursively compute the layout.
-    root.x = 0;
-    root.y = 0;
-    d3_layout_packTree(root);
-
-    // Scale the layout to fit the requested size.
-    var w = size[0],
-        h = size[1],
-        k = 1 / Math.max(2 * root.r / w, 2 * root.r / h);
-    d3_layout_packTransform(root, w / 2, h / 2, k);
-
-    return nodes;
-  }
-
-  pack.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return pack;
-  };
-
-  return d3_layout_hierarchyRebind(pack, hierarchy);
-};
-
-function d3_layout_packSort(a, b) {
-  return a.value - b.value;
-}
-
-function d3_layout_packInsert(a, b) {
-  var c = a._pack_next;
-  a._pack_next = b;
-  b._pack_prev = a;
-  b._pack_next = c;
-  c._pack_prev = b;
-}
-
-function d3_layout_packSplice(a, b) {
-  a._pack_next = b;
-  b._pack_prev = a;
-}
-
-function d3_layout_packIntersects(a, b) {
-  var dx = b.x - a.x,
-      dy = b.y - a.y,
-      dr = a.r + b.r;
-  return dr * dr - dx * dx - dy * dy > .001; // within epsilon
-}
-
-function d3_layout_packCircle(nodes) {
-  var xMin = Infinity,
-      xMax = -Infinity,
-      yMin = Infinity,
-      yMax = -Infinity,
-      n = nodes.length,
-      a, b, c, j, k;
-
-  function bound(node) {
-    xMin = Math.min(node.x - node.r, xMin);
-    xMax = Math.max(node.x + node.r, xMax);
-    yMin = Math.min(node.y - node.r, yMin);
-    yMax = Math.max(node.y + node.r, yMax);
-  }
-
-  // Create node links.
-  nodes.forEach(d3_layout_packLink);
-
-  // Create first node.
-  a = nodes[0];
-  a.x = -a.r;
-  a.y = 0;
-  bound(a);
-
-  // Create second node.
-  if (n > 1) {
-    b = nodes[1];
-    b.x = b.r;
-    b.y = 0;
-    bound(b);
-
-    // Create third node and build chain.
-    if (n > 2) {
-      c = nodes[2];
-      d3_layout_packPlace(a, b, c);
-      bound(c);
-      d3_layout_packInsert(a, c);
-      a._pack_prev = c;
-      d3_layout_packInsert(c, b);
-      b = a._pack_next;
-
-      // Now iterate through the rest.
-      for (var i = 3; i < n; i++) {
-        d3_layout_packPlace(a, b, c = nodes[i]);
-
-        // Search for the closest intersection.
-        var isect = 0, s1 = 1, s2 = 1;
-        for (j = b._pack_next; j !== b; j = j._pack_next, s1++) {
-          if (d3_layout_packIntersects(j, c)) {
-            isect = 1;
-            break;
-          }
-        }
-        if (isect == 1) {
-          for (k = a._pack_prev; k !== j._pack_prev; k = k._pack_prev, s2++) {
-            if (d3_layout_packIntersects(k, c)) {
-              break;
-            }
-          }
-        }
-
-        // Update node chain.
-        if (isect) {
-          if (s1 < s2 || (s1 == s2 && b.r < a.r)) d3_layout_packSplice(a, b = j);
-          else d3_layout_packSplice(a = k, b);
-          i--;
-        } else {
-          d3_layout_packInsert(a, c);
-          b = c;
-          bound(c);
-        }
-      }
-    }
-  }
-
-  // Re-center the circles and return the encompassing radius.
-  var cx = (xMin + xMax) / 2,
-      cy = (yMin + yMax) / 2,
-      cr = 0;
-  for (var i = 0; i < n; i++) {
-    var node = nodes[i];
-    node.x -= cx;
-    node.y -= cy;
-    cr = Math.max(cr, node.r + Math.sqrt(node.x * node.x + node.y * node.y));
-  }
-
-  // Remove node links.
-  nodes.forEach(d3_layout_packUnlink);
-
-  return cr;
-}
-
-function d3_layout_packLink(node) {
-  node._pack_next = node._pack_prev = node;
-}
-
-function d3_layout_packUnlink(node) {
-  delete node._pack_next;
-  delete node._pack_prev;
-}
-
-function d3_layout_packTree(node) {
-  var children = node.children;
-  if (children && children.length) {
-    children.forEach(d3_layout_packTree);
-    node.r = d3_layout_packCircle(children);
-  } else {
-    node.r = Math.sqrt(node.value);
-  }
-}
-
-function d3_layout_packTransform(node, x, y, k) {
-  var children = node.children;
-  node.x = (x += k * node.x);
-  node.y = (y += k * node.y);
-  node.r *= k;
-  if (children) {
-    var i = -1, n = children.length;
-    while (++i < n) d3_layout_packTransform(children[i], x, y, k);
-  }
-}
-
-function d3_layout_packPlace(a, b, c) {
-  var db = a.r + c.r,
-      dx = b.x - a.x,
-      dy = b.y - a.y;
-  if (db && (dx || dy)) {
-    var da = b.r + c.r,
-        dc = Math.sqrt(dx * dx + dy * dy),
-        cos = Math.max(-1, Math.min(1, (db * db + dc * dc - da * da) / (2 * db * dc))),
-        theta = Math.acos(cos),
-        x = cos * (db /= dc),
-        y = Math.sin(theta) * db;
-    c.x = a.x + x * dx + y * dy;
-    c.y = a.y + x * dy - y * dx;
-  } else {
-    c.x = a.x + db;
-    c.y = a.y;
-  }
-}
-// Implements a hierarchical layout using the cluster (or dendrogram)
-// algorithm.
-d3.layout.cluster = function() {
-  var hierarchy = d3.layout.hierarchy().sort(null).value(null),
-      separation = d3_layout_treeSeparation,
-      size = [1, 1]; // width, height
-
-  function cluster(d, i) {
-    var nodes = hierarchy.call(this, d, i),
-        root = nodes[0],
-        previousNode,
-        x = 0,
-        kx,
-        ky;
-
-    // First walk, computing the initial x & y values.
-    d3_layout_treeVisitAfter(root, function(node) {
-      var children = node.children;
-      if (children && children.length) {
-        node.x = d3_layout_clusterX(children);
-        node.y = d3_layout_clusterY(children);
-      } else {
-        node.x = previousNode ? x += separation(node, previousNode) : 0;
-        node.y = 0;
-        previousNode = node;
-      }
-    });
-
-    // Compute the left-most, right-most, and depth-most nodes for extents.
-    var left = d3_layout_clusterLeft(root),
-        right = d3_layout_clusterRight(root),
-        x0 = left.x - separation(left, right) / 2,
-        x1 = right.x + separation(right, left) / 2;
-
-    // Second walk, normalizing x & y to the desired size.
-    d3_layout_treeVisitAfter(root, function(node) {
-      node.x = (node.x - x0) / (x1 - x0) * size[0];
-      node.y = (1 - (root.y ? node.y / root.y : 1)) * size[1];
-    });
-
-    return nodes;
-  }
-
-  cluster.separation = function(x) {
-    if (!arguments.length) return separation;
-    separation = x;
-    return cluster;
-  };
-
-  cluster.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return cluster;
-  };
-
-  return d3_layout_hierarchyRebind(cluster, hierarchy);
-};
-
-function d3_layout_clusterY(children) {
-  return 1 + d3.max(children, function(child) {
-    return child.y;
-  });
-}
-
-function d3_layout_clusterX(children) {
-  return children.reduce(function(x, child) {
-    return x + child.x;
-  }, 0) / children.length;
-}
-
-function d3_layout_clusterLeft(node) {
-  var children = node.children;
-  return children && children.length ? d3_layout_clusterLeft(children[0]) : node;
-}
-
-function d3_layout_clusterRight(node) {
-  var children = node.children, n;
-  return children && (n = children.length) ? d3_layout_clusterRight(children[n - 1]) : node;
-}
-// Node-link tree diagram using the Reingold-Tilford "tidy" algorithm
-d3.layout.tree = function() {
-  var hierarchy = d3.layout.hierarchy().sort(null).value(null),
-      separation = d3_layout_treeSeparation,
-      size = [1, 1]; // width, height
-
-  function tree(d, i) {
-    var nodes = hierarchy.call(this, d, i),
-        root = nodes[0];
-
-    function firstWalk(node, previousSibling) {
-      var children = node.children,
-          layout = node._tree;
-      if (children && (n = children.length)) {
-        var n,
-            firstChild = children[0],
-            previousChild,
-            ancestor = firstChild,
-            child,
-            i = -1;
-        while (++i < n) {
-          child = children[i];
-          firstWalk(child, previousChild);
-          ancestor = apportion(child, previousChild, ancestor);
-          previousChild = child;
-        }
-        d3_layout_treeShift(node);
-        var midpoint = .5 * (firstChild._tree.prelim + child._tree.prelim);
-        if (previousSibling) {
-          layout.prelim = previousSibling._tree.prelim + separation(node, previousSibling);
-          layout.mod = layout.prelim - midpoint;
-        } else {
-          layout.prelim = midpoint;
-        }
-      } else {
-        if (previousSibling) {
-          layout.prelim = previousSibling._tree.prelim + separation(node, previousSibling);
-        }
-      }
-    }
-
-    function secondWalk(node, x) {
-      node.x = node._tree.prelim + x;
-      var children = node.children;
-      if (children && (n = children.length)) {
-        var i = -1,
-            n;
-        x += node._tree.mod;
-        while (++i < n) {
-          secondWalk(children[i], x);
-        }
-      }
-    }
-
-    function apportion(node, previousSibling, ancestor) {
-      if (previousSibling) {
-        var vip = node,
-            vop = node,
-            vim = previousSibling,
-            vom = node.parent.children[0],
-            sip = vip._tree.mod,
-            sop = vop._tree.mod,
-            sim = vim._tree.mod,
-            som = vom._tree.mod,
-            shift;
-        while (vim = d3_layout_treeRight(vim), vip = d3_layout_treeLeft(vip), vim && vip) {
-          vom = d3_layout_treeLeft(vom);
-          vop = d3_layout_treeRight(vop);
-          vop._tree.ancestor = node;
-          shift = vim._tree.prelim + sim - vip._tree.prelim - sip + separation(vim, vip);
-          if (shift > 0) {
-            d3_layout_treeMove(d3_layout_treeAncestor(vim, node, ancestor), node, shift);
-            sip += shift;
-            sop += shift;
-          }
-          sim += vim._tree.mod;
-          sip += vip._tree.mod;
-          som += vom._tree.mod;
-          sop += vop._tree.mod;
-        }
-        if (vim && !d3_layout_treeRight(vop)) {
-          vop._tree.thread = vim;
-          vop._tree.mod += sim - sop;
-        }
-        if (vip && !d3_layout_treeLeft(vom)) {
-          vom._tree.thread = vip;
-          vom._tree.mod += sip - som;
-          ancestor = node;
-        }
-      }
-      return ancestor;
-    }
-
-    // Initialize temporary layout variables.
-    d3_layout_treeVisitAfter(root, function(node, previousSibling) {
-      node._tree = {
-        ancestor: node,
-        prelim: 0,
-        mod: 0,
-        change: 0,
-        shift: 0,
-        number: previousSibling ? previousSibling._tree.number + 1 : 0
-      };
-    });
-
-    // Compute the layout using Buchheim et al.'s algorithm.
-    firstWalk(root);
-    secondWalk(root, -root._tree.prelim);
-
-    // Compute the left-most, right-most, and depth-most nodes for extents.
-    var left = d3_layout_treeSearch(root, d3_layout_treeLeftmost),
-        right = d3_layout_treeSearch(root, d3_layout_treeRightmost),
-        deep = d3_layout_treeSearch(root, d3_layout_treeDeepest),
-        x0 = left.x - separation(left, right) / 2,
-        x1 = right.x + separation(right, left) / 2,
-        y1 = deep.depth || 1;
-
-    // Clear temporary layout variables; transform x and y.
-    d3_layout_treeVisitAfter(root, function(node) {
-      node.x = (node.x - x0) / (x1 - x0) * size[0];
-      node.y = node.depth / y1 * size[1];
-      delete node._tree;
-    });
-
-    return nodes;
-  }
-
-  tree.separation = function(x) {
-    if (!arguments.length) return separation;
-    separation = x;
-    return tree;
-  };
-
-  tree.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return tree;
-  };
-
-  return d3_layout_hierarchyRebind(tree, hierarchy);
-};
-
-function d3_layout_treeSeparation(a, b) {
-  return a.parent == b.parent ? 1 : 2;
-}
-
-// function d3_layout_treeSeparationRadial(a, b) {
-//   return (a.parent == b.parent ? 1 : 2) / a.depth;
-// }
-
-function d3_layout_treeLeft(node) {
-  var children = node.children;
-  return children && children.length ? children[0] : node._tree.thread;
-}
-
-function d3_layout_treeRight(node) {
-  var children = node.children,
-      n;
-  return children && (n = children.length) ? children[n - 1] : node._tree.thread;
-}
-
-function d3_layout_treeSearch(node, compare) {
-  var children = node.children;
-  if (children && (n = children.length)) {
-    var child,
-        n,
-        i = -1;
-    while (++i < n) {
-      if (compare(child = d3_layout_treeSearch(children[i], compare), node) > 0) {
-        node = child;
-      }
-    }
-  }
-  return node;
-}
-
-function d3_layout_treeRightmost(a, b) {
-  return a.x - b.x;
-}
-
-function d3_layout_treeLeftmost(a, b) {
-  return b.x - a.x;
-}
-
-function d3_layout_treeDeepest(a, b) {
-  return a.depth - b.depth;
-}
-
-function d3_layout_treeVisitAfter(node, callback) {
-  function visit(node, previousSibling) {
-    var children = node.children;
-    if (children && (n = children.length)) {
-      var child,
-          previousChild = null,
-          i = -1,
-          n;
-      while (++i < n) {
-        child = children[i];
-        visit(child, previousChild);
-        previousChild = child;
-      }
-    }
-    callback(node, previousSibling);
-  }
-  visit(node, null);
-}
-
-function d3_layout_treeShift(node) {
-  var shift = 0,
-      change = 0,
-      children = node.children,
-      i = children.length,
-      child;
-  while (--i >= 0) {
-    child = children[i]._tree;
-    child.prelim += shift;
-    child.mod += shift;
-    shift += child.shift + (change += child.change);
-  }
-}
-
-function d3_layout_treeMove(ancestor, node, shift) {
-  ancestor = ancestor._tree;
-  node = node._tree;
-  var change = shift / (node.number - ancestor.number);
-  ancestor.change += change;
-  node.change -= change;
-  node.shift += shift;
-  node.prelim += shift;
-  node.mod += shift;
-}
-
-function d3_layout_treeAncestor(vim, node, ancestor) {
-  return vim._tree.ancestor.parent == node.parent
-      ? vim._tree.ancestor
-      : ancestor;
-}
-// Squarified Treemaps by Mark Bruls, Kees Huizing, and Jarke J. van Wijk
-// Modified to support a target aspect ratio by Jeff Heer
-d3.layout.treemap = function() {
-  var hierarchy = d3.layout.hierarchy(),
-      round = Math.round,
-      size = [1, 1], // width, height
-      padding = null,
-      pad = d3_layout_treemapPadNull,
-      sticky = false,
-      stickies,
-      ratio = 0.5 * (1 + Math.sqrt(5)); // golden ratio
-
-  // Compute the area for each child based on value & scale.
-  function scale(children, k) {
-    var i = -1,
-        n = children.length,
-        child,
-        area;
-    while (++i < n) {
-      area = (child = children[i]).value * (k < 0 ? 0 : k);
-      child.area = isNaN(area) || area <= 0 ? 0 : area;
-    }
-  }
-
-  // Recursively arranges the specified node's children into squarified rows.
-  function squarify(node) {
-    var children = node.children;
-    if (children && children.length) {
-      var rect = pad(node),
-          row = [],
-          remaining = children.slice(), // copy-on-write
-          child,
-          best = Infinity, // the best row score so far
-          score, // the current row score
-          u = Math.min(rect.dx, rect.dy), // initial orientation
-          n;
-      scale(remaining, rect.dx * rect.dy / node.value);
-      row.area = 0;
-      while ((n = remaining.length) > 0) {
-        row.push(child = remaining[n - 1]);
-        row.area += child.area;
-        if ((score = worst(row, u)) <= best) { // continue with this orientation
-          remaining.pop();
-          best = score;
-        } else { // abort, and try a different orientation
-          row.area -= row.pop().area;
-          position(row, u, rect, false);
-          u = Math.min(rect.dx, rect.dy);
-          row.length = row.area = 0;
-          best = Infinity;
-        }
-      }
-      if (row.length) {
-        position(row, u, rect, true);
-        row.length = row.area = 0;
-      }
-      children.forEach(squarify);
-    }
-  }
-
-  // Recursively resizes the specified node's children into existing rows.
-  // Preserves the existing layout!
-  function stickify(node) {
-    var children = node.children;
-    if (children && children.length) {
-      var rect = pad(node),
-          remaining = children.slice(), // copy-on-write
-          child,
-          row = [];
-      scale(remaining, rect.dx * rect.dy / node.value);
-      row.area = 0;
-      while (child = remaining.pop()) {
-        row.push(child);
-        row.area += child.area;
-        if (child.z != null) {
-          position(row, child.z ? rect.dx : rect.dy, rect, !remaining.length);
-          row.length = row.area = 0;
-        }
-      }
-      children.forEach(stickify);
-    }
-  }
-
-  // Computes the score for the specified row, as the worst aspect ratio.
-  function worst(row, u) {
-    var s = row.area,
-        r,
-        rmax = 0,
-        rmin = Infinity,
-        i = -1,
-        n = row.length;
-    while (++i < n) {
-      if (!(r = row[i].area)) continue;
-      if (r < rmin) rmin = r;
-      if (r > rmax) rmax = r;
-    }
-    s *= s;
-    u *= u;
-    return s
-        ? Math.max((u * rmax * ratio) / s, s / (u * rmin * ratio))
-        : Infinity;
-  }
-
-  // Positions the specified row of nodes. Modifies `rect`.
-  function position(row, u, rect, flush) {
-    var i = -1,
-        n = row.length,
-        x = rect.x,
-        y = rect.y,
-        v = u ? round(row.area / u) : 0,
-        o;
-    if (u == rect.dx) { // horizontal subdivision
-      if (flush || v > rect.dy) v = rect.dy; // over+underflow
-      while (++i < n) {
-        o = row[i];
-        o.x = x;
-        o.y = y;
-        o.dy = v;
-        x += o.dx = Math.min(rect.x + rect.dx - x, v ? round(o.area / v) : 0);
-      }
-      o.z = true;
-      o.dx += rect.x + rect.dx - x; // rounding error
-      rect.y += v;
-      rect.dy -= v;
-    } else { // vertical subdivision
-      if (flush || v > rect.dx) v = rect.dx; // over+underflow
-      while (++i < n) {
-        o = row[i];
-        o.x = x;
-        o.y = y;
-        o.dx = v;
-        y += o.dy = Math.min(rect.y + rect.dy - y, v ? round(o.area / v) : 0);
-      }
-      o.z = false;
-      o.dy += rect.y + rect.dy - y; // rounding error
-      rect.x += v;
-      rect.dx -= v;
-    }
-  }
-
-  function treemap(d) {
-    var nodes = stickies || hierarchy(d),
-        root = nodes[0];
-    root.x = 0;
-    root.y = 0;
-    root.dx = size[0];
-    root.dy = size[1];
-    if (stickies) hierarchy.revalue(root);
-    scale([root], root.dx * root.dy / root.value);
-    (stickies ? stickify : squarify)(root);
-    if (sticky) stickies = nodes;
-    return nodes;
-  }
-
-  treemap.size = function(x) {
-    if (!arguments.length) return size;
-    size = x;
-    return treemap;
-  };
-
-  treemap.padding = function(x) {
-    if (!arguments.length) return padding;
-
-    function padFunction(node) {
-      var p = x.call(treemap, node, node.depth);
-      return p == null
-          ? d3_layout_treemapPadNull(node)
-          : d3_layout_treemapPad(node, typeof p === "number" ? [p, p, p, p] : p);
-    }
-
-    function padConstant(node) {
-      return d3_layout_treemapPad(node, x);
-    }
-
-    var type;
-    pad = (padding = x) == null ? d3_layout_treemapPadNull
-        : (type = typeof x) === "function" ? padFunction
-        : type === "number" ? (x = [x, x, x, x], padConstant)
-        : padConstant;
-    return treemap;
-  };
-
-  treemap.round = function(x) {
-    if (!arguments.length) return round != Number;
-    round = x ? Math.round : Number;
-    return treemap;
-  };
-
-  treemap.sticky = function(x) {
-    if (!arguments.length) return sticky;
-    sticky = x;
-    stickies = null;
-    return treemap;
-  };
-
-  treemap.ratio = function(x) {
-    if (!arguments.length) return ratio;
-    ratio = x;
-    return treemap;
-  };
-
-  return d3_layout_hierarchyRebind(treemap, hierarchy);
-};
-
-function d3_layout_treemapPadNull(node) {
-  return {x: node.x, y: node.y, dx: node.dx, dy: node.dy};
-}
-
-function d3_layout_treemapPad(node, padding) {
-  var x = node.x + padding[3],
-      y = node.y + padding[0],
-      dx = node.dx - padding[1] - padding[3],
-      dy = node.dy - padding[0] - padding[2];
-  if (dx < 0) { x += dx / 2; dx = 0; }
-  if (dy < 0) { y += dy / 2; dy = 0; }
-  return {x: x, y: y, dx: dx, dy: dy};
-}
-d3.csv = function(url, callback) {
-  d3.text(url, "text/csv", function(text) {
-    callback(text && d3.csv.parse(text));
-  });
-};
-d3.csv.parse = function(text) {
-  var header;
-  return d3.csv.parseRows(text, function(row, i) {
-    if (i) {
-      var o = {}, j = -1, m = header.length;
-      while (++j < m) o[header[j]] = row[j];
-      return o;
-    } else {
-      header = row;
-      return null;
-    }
-  });
-};
-
-d3.csv.parseRows = function(text, f) {
-  var EOL = {}, // sentinel value for end-of-line
-      EOF = {}, // sentinel value for end-of-file
-      rows = [], // output rows
-      re = /\r\n|[,\r\n]/g, // field separator regex
-      n = 0, // the current line number
-      t, // the current token
-      eol; // is the current token followed by EOL?
-
-  re.lastIndex = 0; // work-around bug in FF 3.6
-
-  /** @private Returns the next token. */
-  function token() {
-    if (re.lastIndex >= text.length) return EOF; // special case: end of file
-    if (eol) { eol = false; return EOL; } // special case: end of line
-
-    // special case: quotes
-    var j = re.lastIndex;
-    if (text.charCodeAt(j) === 34) {
-      var i = j;
-      while (i++ < text.length) {
-        if (text.charCodeAt(i) === 34) {
-          if (text.charCodeAt(i + 1) !== 34) break;
-          i++;
-        }
-      }
-      re.lastIndex = i + 2;
-      var c = text.charCodeAt(i + 1);
-      if (c === 13) {
-        eol = true;
-        if (text.charCodeAt(i + 2) === 10) re.lastIndex++;
-      } else if (c === 10) {
-        eol = true;
-      }
-      return text.substring(j + 1, i).replace(/""/g, "\"");
-    }
-
-    // common case
-    var m = re.exec(text);
-    if (m) {
-      eol = m[0].charCodeAt(0) !== 44;
-      return text.substring(j, m.index);
-    }
-    re.lastIndex = text.length;
-    return text.substring(j);
-  }
-
-  while ((t = token()) !== EOF) {
-    var a = [];
-    while ((t !== EOL) && (t !== EOF)) {
-      a.push(t);
-      t = token();
-    }
-    if (f && !(a = f(a, n++))) continue;
-    rows.push(a);
-  }
-
-  return rows;
-};
-d3.csv.format = function(rows) {
-  return rows.map(d3_csv_formatRow).join("\n");
-};
-
-function d3_csv_formatRow(row) {
-  return row.map(d3_csv_formatValue).join(",");
-}
-
-function d3_csv_formatValue(text) {
-  return /[",\n]/.test(text)
-      ? "\"" + text.replace(/\"/g, "\"\"") + "\""
-      : text;
-}
-d3.geo = {};
-
-var d3_geo_radians = Math.PI / 180;
-// TODO clip input coordinates on opposite hemisphere
-d3.geo.azimuthal = function() {
-  var mode = "orthographic", // or stereographic, gnomonic, equidistant or equalarea
-      origin,
-      scale = 200,
-      translate = [480, 250],
-      x0,
-      y0,
-      cy0,
-      sy0;
-
-  function azimuthal(coordinates) {
-    var x1 = coordinates[0] * d3_geo_radians - x0,
-        y1 = coordinates[1] * d3_geo_radians,
-        cx1 = Math.cos(x1),
-        sx1 = Math.sin(x1),
-        cy1 = Math.cos(y1),
-        sy1 = Math.sin(y1),
-        cc = mode !== "orthographic" ? sy0 * sy1 + cy0 * cy1 * cx1 : null,
-        c,
-        k = mode === "stereographic" ? 1 / (1 + cc)
-          : mode === "gnomonic" ? 1 / cc
-          : mode === "equidistant" ? (c = Math.acos(cc), c ? c / Math.sin(c) : 0)
-          : mode === "equalarea" ? Math.sqrt(2 / (1 + cc))
-          : 1,
-        x = k * cy1 * sx1,
-        y = k * (sy0 * cy1 * cx1 - cy0 * sy1);
-    return [
-      scale * x + translate[0],
-      scale * y + translate[1]
-    ];
-  }
-
-  azimuthal.invert = function(coordinates) {
-    var x = (coordinates[0] - translate[0]) / scale,
-        y = (coordinates[1] - translate[1]) / scale,
-        p = Math.sqrt(x * x + y * y),
-        c = mode === "stereographic" ? 2 * Math.atan(p)
-          : mode === "gnomonic" ? Math.atan(p)
-          : mode === "equidistant" ? p
-          : mode === "equalarea" ? 2 * Math.asin(.5 * p)
-          : Math.asin(p),
-        sc = Math.sin(c),
-        cc = Math.cos(c);
-    return [
-      (x0 + Math.atan2(x * sc, p * cy0 * cc + y * sy0 * sc)) / d3_geo_radians,
-      Math.asin(cc * sy0 - (p ? (y * sc * cy0) / p : 0)) / d3_geo_radians
-    ];
-  };
-
-  azimuthal.mode = function(x) {
-    if (!arguments.length) return mode;
-    mode = x + "";
-    return azimuthal;
-  };
-
-  azimuthal.origin = function(x) {
-    if (!arguments.length) return origin;
-    origin = x;
-    x0 = origin[0] * d3_geo_radians;
-    y0 = origin[1] * d3_geo_radians;
-    cy0 = Math.cos(y0);
-    sy0 = Math.sin(y0);
-    return azimuthal;
-  };
-
-  azimuthal.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = +x;
-    return azimuthal;
-  };
-
-  azimuthal.translate = function(x) {
-    if (!arguments.length) return translate;
-    translate = [+x[0], +x[1]];
-    return azimuthal;
-  };
-
-  return azimuthal.origin([0, 0]);
-};
-// Derived from Tom Carden's Albers implementation for Protovis.
-// http://gist.github.com/476238
-// http://mathworld.wolfram.com/AlbersEqual-AreaConicProjection.html
-
-d3.geo.albers = function() {
-  var origin = [-98, 38],
-      parallels = [29.5, 45.5],
-      scale = 1000,
-      translate = [480, 250],
-      lng0, // d3_geo_radians * origin[0]
-      n,
-      C,
-      p0;
-
-  function albers(coordinates) {
-    var t = n * (d3_geo_radians * coordinates[0] - lng0),
-        p = Math.sqrt(C - 2 * n * Math.sin(d3_geo_radians * coordinates[1])) / n;
-    return [
-      scale * p * Math.sin(t) + translate[0],
-      scale * (p * Math.cos(t) - p0) + translate[1]
-    ];
-  }
-
-  albers.invert = function(coordinates) {
-    var x = (coordinates[0] - translate[0]) / scale,
-        y = (coordinates[1] - translate[1]) / scale,
-        p0y = p0 + y,
-        t = Math.atan2(x, p0y),
-        p = Math.sqrt(x * x + p0y * p0y);
-    return [
-      (lng0 + t / n) / d3_geo_radians,
-      Math.asin((C - p * p * n * n) / (2 * n)) / d3_geo_radians
-    ];
-  };
-
-  function reload() {
-    var phi1 = d3_geo_radians * parallels[0],
-        phi2 = d3_geo_radians * parallels[1],
-        lat0 = d3_geo_radians * origin[1],
-        s = Math.sin(phi1),
-        c = Math.cos(phi1);
-    lng0 = d3_geo_radians * origin[0];
-    n = .5 * (s + Math.sin(phi2));
-    C = c * c + 2 * n * s;
-    p0 = Math.sqrt(C - 2 * n * Math.sin(lat0)) / n;
-    return albers;
-  }
-
-  albers.origin = function(x) {
-    if (!arguments.length) return origin;
-    origin = [+x[0], +x[1]];
-    return reload();
-  };
-
-  albers.parallels = function(x) {
-    if (!arguments.length) return parallels;
-    parallels = [+x[0], +x[1]];
-    return reload();
-  };
-
-  albers.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = +x;
-    return albers;
-  };
-
-  albers.translate = function(x) {
-    if (!arguments.length) return translate;
-    translate = [+x[0], +x[1]];
-    return albers;
-  };
-
-  return reload();
-};
-
-// A composite projection for the United States, 960x500. The set of standard
-// parallels for each region comes from USGS, which is published here:
-// http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html#albers
-// TODO allow the composite projection to be rescaled?
-d3.geo.albersUsa = function() {
-  var lower48 = d3.geo.albers();
-
-  var alaska = d3.geo.albers()
-      .origin([-160, 60])
-      .parallels([55, 65]);
-
-  var hawaii = d3.geo.albers()
-      .origin([-160, 20])
-      .parallels([8, 18]);
-
-  var puertoRico = d3.geo.albers()
-      .origin([-60, 10])
-      .parallels([8, 18]);
-
-  function albersUsa(coordinates) {
-    var lon = coordinates[0],
-        lat = coordinates[1];
-    return (lat > 50 ? alaska
-        : lon < -140 ? hawaii
-        : lat < 21 ? puertoRico
-        : lower48)(coordinates);
-  }
-
-  albersUsa.scale = function(x) {
-    if (!arguments.length) return lower48.scale();
-    lower48.scale(x);
-    alaska.scale(x * .6);
-    hawaii.scale(x);
-    puertoRico.scale(x * 1.5);
-    return albersUsa.translate(lower48.translate());
-  };
-
-  albersUsa.translate = function(x) {
-    if (!arguments.length) return lower48.translate();
-    var dz = lower48.scale() / 1000,
-        dx = x[0],
-        dy = x[1];
-    lower48.translate(x);
-    alaska.translate([dx - 400 * dz, dy + 170 * dz]);
-    hawaii.translate([dx - 190 * dz, dy + 200 * dz]);
-    puertoRico.translate([dx + 580 * dz, dy + 430 * dz]);
-    return albersUsa;
-  };
-
-  return albersUsa.scale(lower48.scale());
-};
-d3.geo.bonne = function() {
-  var scale = 200,
-      translate = [480, 250],
-      x0, // origin longitude in radians
-      y0, // origin latitude in radians
-      y1, // parallel latitude in radians
-      c1; // cot(y1)
-
-  function bonne(coordinates) {
-    var x = coordinates[0] * d3_geo_radians - x0,
-        y = coordinates[1] * d3_geo_radians - y0;
-    if (y1) {
-      var p = c1 + y1 - y, E = x * Math.cos(y) / p;
-      x = p * Math.sin(E);
-      y = p * Math.cos(E) - c1;
-    } else {
-      x *= Math.cos(y);
-      y *= -1;
-    }
-    return [
-      scale * x + translate[0],
-      scale * y + translate[1]
-    ];
-  }
-
-  bonne.invert = function(coordinates) {
-    var x = (coordinates[0] - translate[0]) / scale,
-        y = (coordinates[1] - translate[1]) / scale;
-    if (y1) {
-      var c = c1 + y, p = Math.sqrt(x * x + c * c);
-      y = c1 + y1 - p;
-      x = x0 + p * Math.atan2(x, c) / Math.cos(y);
-    } else {
-      y *= -1;
-      x /= Math.cos(y);
-    }
-    return [
-      x / d3_geo_radians,
-      y / d3_geo_radians
-    ];
-  };
-
-  // 90° for Werner, 0° for Sinusoidal
-  bonne.parallel = function(x) {
-    if (!arguments.length) return y1 / d3_geo_radians;
-    c1 = 1 / Math.tan(y1 = x * d3_geo_radians);
-    return bonne;
-  };
-
-  bonne.origin = function(x) {
-    if (!arguments.length) return [x0 / d3_geo_radians, y0 / d3_geo_radians];
-    x0 = x[0] * d3_geo_radians;
-    y0 = x[1] * d3_geo_radians;
-    return bonne;
-  };
-
-  bonne.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = +x;
-    return bonne;
-  };
-
-  bonne.translate = function(x) {
-    if (!arguments.length) return translate;
-    translate = [+x[0], +x[1]];
-    return bonne;
-  };
-
-  return bonne.origin([0, 0]).parallel(45);
-};
-d3.geo.equirectangular = function() {
-  var scale = 500,
-      translate = [480, 250];
-
-  function equirectangular(coordinates) {
-    var x = coordinates[0] / 360,
-        y = -coordinates[1] / 360;
-    return [
-      scale * x + translate[0],
-      scale * y + translate[1]
-    ];
-  }
-
-  equirectangular.invert = function(coordinates) {
-    var x = (coordinates[0] - translate[0]) / scale,
-        y = (coordinates[1] - translate[1]) / scale;
-    return [
-      360 * x,
-      -360 * y
-    ];
-  };
-
-  equirectangular.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = +x;
-    return equirectangular;
-  };
-
-  equirectangular.translate = function(x) {
-    if (!arguments.length) return translate;
-    translate = [+x[0], +x[1]];
-    return equirectangular;
-  };
-
-  return equirectangular;
-};
-d3.geo.mercator = function() {
-  var scale = 500,
-      translate = [480, 250];
-
-  function mercator(coordinates) {
-    var x = coordinates[0] / 360,
-        y = -(Math.log(Math.tan(Math.PI / 4 + coordinates[1] * d3_geo_radians / 2)) / d3_geo_radians) / 360;
-    return [
-      scale * x + translate[0],
-      scale * Math.max(-.5, Math.min(.5, y)) + translate[1]
-    ];
-  }
-
-  mercator.invert = function(coordinates) {
-    var x = (coordinates[0] - translate[0]) / scale,
-        y = (coordinates[1] - translate[1]) / scale;
-    return [
-      360 * x,
-      2 * Math.atan(Math.exp(-360 * y * d3_geo_radians)) / d3_geo_radians - 90
-    ];
-  };
-
-  mercator.scale = function(x) {
-    if (!arguments.length) return scale;
-    scale = +x;
-    return mercator;
-  };
-
-  mercator.translate = function(x) {
-    if (!arguments.length) return translate;
-    translate = [+x[0], +x[1]];
-    return mercator;
-  };
-
-  return mercator;
-};
-function d3_geo_type(types, defaultValue) {
-  return function(object) {
-    return object && types.hasOwnProperty(object.type) ? types[object.type](object) : defaultValue;
-  };
-}
-/**
- * Returns a function that, given a GeoJSON object (e.g., a feature), returns
- * the corresponding SVG path. The function can be customized by overriding the
- * projection. Point features are mapped to circles with a default radius of
- * 4.5px; the radius can be specified either as a constant or a function that
- * is evaluated per object.
- */
-d3.geo.path = function() {
-  var pointRadius = 4.5,
-      pointCircle = d3_path_circle(pointRadius),
-      projection = d3.geo.albersUsa();
-
-  function path(d, i) {
-    if (typeof pointRadius === "function") {
-      pointCircle = d3_path_circle(pointRadius.apply(this, arguments));
-    }
-    return pathType(d) || null;
-  }
-
-  function project(coordinates) {
-    return projection(coordinates).join(",");
-  }
-
-  var pathType = d3_geo_type({
-
-    FeatureCollection: function(o) {
-      var path = [],
-          features = o.features,
-          i = -1, // features.index
-          n = features.length;
-      while (++i < n) path.push(pathType(features[i].geometry));
-      return path.join("");
-    },
-
-    Feature: function(o) {
-      return pathType(o.geometry);
-    },
-
-    Point: function(o) {
-      return "M" + project(o.coordinates) + pointCircle;
-    },
-
-    MultiPoint: function(o) {
-      var path = [],
-          coordinates = o.coordinates,
-          i = -1, // coordinates.index
-          n = coordinates.length;
-      while (++i < n) path.push("M", project(coordinates[i]), pointCircle);
-      return path.join("");
-    },
-
-    LineString: function(o) {
-      var path = ["M"],
-          coordinates = o.coordinates,
-          i = -1, // coordinates.index
-          n = coordinates.length;
-      while (++i < n) path.push(project(coordinates[i]), "L");
-      path.pop();
-      return path.join("");
-    },
-
-    MultiLineString: function(o) {
-      var path = [],
-          coordinates = o.coordinates,
-          i = -1, // coordinates.index
-          n = coordinates.length,
-          subcoordinates, // coordinates[i]
-          j, // subcoordinates.index
-          m; // subcoordinates.length
-      while (++i < n) {
-        subcoordinates = coordinates[i];
-        j = -1;
-        m = subcoordinates.length;
-        path.push("M");
-        while (++j < m) path.push(project(subcoordinates[j]), "L");
-        path.pop();
-      }
-      return path.join("");
-    },
-
-    Polygon: function(o) {
-      var path = [],
-          coordinates = o.coordinates,
-          i = -1, // coordinates.index
-          n = coordinates.length,
-          subcoordinates, // coordinates[i]
-          j, // subcoordinates.index
-          m; // subcoordinates.length
-      while (++i < n) {
-        subcoordinates = coordinates[i];
-        j = -1;
-        if ((m = subcoordinates.length - 1) > 0) {
-          path.push("M");
-          while (++j < m) path.push(project(subcoordinates[j]), "L");
-          path[path.length - 1] = "Z";
-        }
-      }
-      return path.join("");
-    },
-
-    MultiPolygon: function(o) {
-      var path = [],
-          coordinates = o.coordinates,
-          i = -1, // coordinates index
-          n = coordinates.length,
-          subcoordinates, // coordinates[i]
-          j, // subcoordinates index
-          m, // subcoordinates.length
-          subsubcoordinates, // subcoordinates[j]
-          k, // subsubcoordinates index
-          p; // subsubcoordinates.length
-      while (++i < n) {
-        subcoordinates = coordinates[i];
-        j = -1;
-        m = subcoordinates.length;
-        while (++j < m) {
-          subsubcoordinates = subcoordinates[j];
-          k = -1;
-          if ((p = subsubcoordinates.length - 1) > 0) {
-            path.push("M");
-            while (++k < p) path.push(project(subsubcoordinates[k]), "L");
-            path[path.length - 1] = "Z";
-          }
-        }
-      }
-      return path.join("");
-    },
-
-    GeometryCollection: function(o) {
-      var path = [],
-          geometries = o.geometries,
-          i = -1, // geometries index
-          n = geometries.length;
-      while (++i < n) path.push(pathType(geometries[i]));
-      return path.join("");
-    }
-
-  });
-
-  var areaType = path.area = d3_geo_type({
-
-    FeatureCollection: function(o) {
-      var area = 0,
-          features = o.features,
-          i = -1, // features.index
-          n = features.length;
-      while (++i < n) area += areaType(features[i]);
-      return area;
-    },
-
-    Feature: function(o) {
-      return areaType(o.geometry);
-    },
-
-    Polygon: function(o) {
-      return polygonArea(o.coordinates);
-    },
-
-    MultiPolygon: function(o) {
-      var sum = 0,
-          coordinates = o.coordinates,
-          i = -1, // coordinates index
-          n = coordinates.length;
-      while (++i < n) sum += polygonArea(coordinates[i]);
-      return sum;
-    },
-
-    GeometryCollection: function(o) {
-      var sum = 0,
-          geometries = o.geometries,
-          i = -1, // geometries index
-          n = geometries.length;
-      while (++i < n) sum += areaType(geometries[i]);
-      return sum;
-    }
-
-  }, 0);
-
-  function polygonArea(coordinates) {
-    var sum = area(coordinates[0]), // exterior ring
-        i = 0, // coordinates.index
-        n = coordinates.length;
-    while (++i < n) sum -= area(coordinates[i]); // holes
-    return sum;
-  }
-
-  function polygonCentroid(coordinates) {
-    var polygon = d3.geom.polygon(coordinates[0].map(projection)), // exterior ring
-        area = polygon.area(),
-        centroid = polygon.centroid(area < 0 ? (area *= -1, 1) : -1),
-        x = centroid[0],
-        y = centroid[1],
-        z = area,
-        i = 0, // coordinates index
-        n = coordinates.length;
-    while (++i < n) {
-      polygon = d3.geom.polygon(coordinates[i].map(projection)); // holes
-      area = polygon.area();
-      centroid = polygon.centroid(area < 0 ? (area *= -1, 1) : -1);
-      x -= centroid[0];
-      y -= centroid[1];
-      z -= area;
-    }
-    return [x, y, 6 * z]; // weighted centroid
-  }
-
-  var centroidType = path.centroid = d3_geo_type({
-
-    // TODO FeatureCollection
-    // TODO Point
-    // TODO MultiPoint
-    // TODO LineString
-    // TODO MultiLineString
-    // TODO GeometryCollection
-
-    Feature: function(o) {
-      return centroidType(o.geometry);
-    },
-
-    Polygon: function(o) {
-      var centroid = polygonCentroid(o.coordinates);
-      return [centroid[0] / centroid[2], centroid[1] / centroid[2]];
-    },
-
-    MultiPolygon: function(o) {
-      var area = 0,
-          coordinates = o.coordinates,
-          centroid,
-          x = 0,
-          y = 0,
-          z = 0,
-          i = -1, // coordinates index
-          n = coordinates.length;
-      while (++i < n) {
-        centroid = polygonCentroid(coordinates[i]);
-        x += centroid[0];
-        y += centroid[1];
-        z += centroid[2];
-      }
-      return [x / z, y / z];
-    }
-
-  });
-
-  function area(coordinates) {
-    return Math.abs(d3.geom.polygon(coordinates.map(projection)).area());
-  }
-
-  path.projection = function(x) {
-    projection = x;
-    return path;
-  };
-
-  path.pointRadius = function(x) {
-    if (typeof x === "function") pointRadius = x;
-    else {
-      pointRadius = +x;
-      pointCircle = d3_path_circle(pointRadius);
-    }
-    return path;
-  };
-
-  return path;
-};
-
-function d3_path_circle(radius) {
-  return "m0," + radius
-      + "a" + radius + "," + radius + " 0 1,1 0," + (-2 * radius)
-      + "a" + radius + "," + radius + " 0 1,1 0," + (+2 * radius)
-      + "z";
-}
-/**
- * Given a GeoJSON object, returns the corresponding bounding box. The bounding
- * box is represented by a two-dimensional array: [[left, bottom], [right,
- * top]], where left is the minimum longitude, bottom is the minimum latitude,
- * right is maximum longitude, and top is the maximum latitude.
- */
-d3.geo.bounds = function(feature) {
-  var left = Infinity,
-      bottom = Infinity,
-      right = -Infinity,
-      top = -Infinity;
-  d3_geo_bounds(feature, function(x, y) {
-    if (x < left) left = x;
-    if (x > right) right = x;
-    if (y < bottom) bottom = y;
-    if (y > top) top = y;
-  });
-  return [[left, bottom], [right, top]];
-};
-
-function d3_geo_bounds(o, f) {
-  if (d3_geo_boundsTypes.hasOwnProperty(o.type)) d3_geo_boundsTypes[o.type](o, f);
-}
-
-var d3_geo_boundsTypes = {
-  Feature: d3_geo_boundsFeature,
-  FeatureCollection: d3_geo_boundsFeatureCollection,
-  GeometryCollection: d3_geo_boundsGeometryCollection,
-  LineString: d3_geo_boundsLineString,
-  MultiLineString: d3_geo_boundsMultiLineString,
-  MultiPoint: d3_geo_boundsLineString,
-  MultiPolygon: d3_geo_boundsMultiPolygon,
-  Point: d3_geo_boundsPoint,
-  Polygon: d3_geo_boundsPolygon
-};
-
-function d3_geo_boundsFeature(o, f) {
-  d3_geo_bounds(o.geometry, f);
-}
-
-function d3_geo_boundsFeatureCollection(o, f) {
-  for (var a = o.features, i = 0, n = a.length; i < n; i++) {
-    d3_geo_bounds(a[i].geometry, f);
-  }
-}
-
-function d3_geo_boundsGeometryCollection(o, f) {
-  for (var a = o.geometries, i = 0, n = a.length; i < n; i++) {
-    d3_geo_bounds(a[i], f);
-  }
-}
-
-function d3_geo_boundsLineString(o, f) {
-  for (var a = o.coordinates, i = 0, n = a.length; i < n; i++) {
-    f.apply(null, a[i]);
-  }
-}
-
-function d3_geo_boundsMultiLineString(o, f) {
-  for (var a = o.coordinates, i = 0, n = a.length; i < n; i++) {
-    for (var b = a[i], j = 0, m = b.length; j < m; j++) {
-      f.apply(null, b[j]);
-    }
-  }
-}
-
-function d3_geo_boundsMultiPolygon(o, f) {
-  for (var a = o.coordinates, i = 0, n = a.length; i < n; i++) {
-    for (var b = a[i][0], j = 0, m = b.length; j < m; j++) {
-      f.apply(null, b[j]);
-    }
-  }
-}
-
-function d3_geo_boundsPoint(o, f) {
-  f.apply(null, o.coordinates);
-}
-
-function d3_geo_boundsPolygon(o, f) {
-  for (var a = o.coordinates[0], i = 0, n = a.length; i < n; i++) {
-    f.apply(null, a[i]);
-  }
-}
-// TODO breakAtDateLine?
-
-d3.geo.circle = function() {
-  var origin = [0, 0],
-      degrees = 90 - 1e-2,
-      radians = degrees * d3_geo_radians,
-      arc = d3.geo.greatArc().target(Object);
-
-  function circle() {
-    // TODO render a circle as a Polygon
-  }
-
-  function visible(point) {
-    return arc.distance(point) < radians;
-  }
-
-  circle.clip = function(d) {
-    arc.source(typeof origin === "function" ? origin.apply(this, arguments) : origin);
-    return clipType(d);
-  };
-
-  var clipType = d3_geo_type({
-
-    FeatureCollection: function(o) {
-      var features = o.features.map(clipType).filter(Object);
-      return features && (o = Object.create(o), o.features = features, o);
-    },
-
-    Feature: function(o) {
-      var geometry = clipType(o.geometry);
-      return geometry && (o = Object.create(o), o.geometry = geometry, o);
-    },
-
-    Point: function(o) {
-      return visible(o.coordinates) && o;
-    },
-
-    MultiPoint: function(o) {
-      var coordinates = o.coordinates.filter(visible);
-      return coordinates.length && {
-        type: o.type,
-        coordinates: coordinates
-      };
-    },
-
-    LineString: function(o) {
-      var coordinates = clip(o.coordinates);
-      return coordinates.length && (o = Object.create(o), o.coordinates = coordinates, o);
-    },
-
-    MultiLineString: function(o) {
-      var coordinates = o.coordinates.map(clip).filter(function(d) { return d.length; });
-      return coordinates.length && (o = Object.create(o), o.coordinates = coordinates, o);
-    },
-
-    Polygon: function(o) {
-      var coordinates = o.coordinates.map(clip);
-      return coordinates[0].length && (o = Object.create(o), o.coordinates = coordinates, o);
-    },
-
-    MultiPolygon: function(o) {
-      var coordinates = o.coordinates.map(function(d) { return d.map(clip); }).filter(function(d) { return d[0].length; });
-      return coordinates.length && (o = Object.create(o), o.coordinates = coordinates, o);
-    },
-
-    GeometryCollection: function(o) {
-      var geometries = o.geometries.map(clipType).filter(Object);
-      return geometries.length && (o = Object.create(o), o.geometries = geometries, o);
-    }
-
-  });
-
-  function clip(coordinates) {
-    var i = -1,
-        n = coordinates.length,
-        clipped = [],
-        p0,
-        p1,
-        p2,
-        d0,
-        d1;
-
-    while (++i < n) {
-      d1 = arc.distance(p2 = coordinates[i]);
-      if (d1 < radians) {
-        if (p1) clipped.push(d3_geo_greatArcInterpolate(p1, p2)((d0 - radians) / (d0 - d1)));
-        clipped.push(p2);
-        p0 = p1 = null;
-      } else {
-        p1 = p2;
-        if (!p0 && clipped.length) {
-          clipped.push(d3_geo_greatArcInterpolate(clipped[clipped.length - 1], p1)((radians - d0) / (d1 - d0)));
-          p0 = p1;
-        }
-      }
-      d0 = d1;
-    }
-
-    if (p1 && clipped.length) {
-      d1 = arc.distance(p2 = clipped[0]);
-      clipped.push(d3_geo_greatArcInterpolate(p1, p2)((d0 - radians) / (d0 - d1)));
-    }
-
-    return resample(clipped);
-  }
-
-  // Resample coordinates, creating great arcs between each.
-  function resample(coordinates) {
-    var i = 0,
-        n = coordinates.length,
-        j,
-        m,
-        resampled = n ? [coordinates[0]] : coordinates,
-        resamples,
-        origin = arc.source();
-
-    while (++i < n) {
-      resamples = arc.source(coordinates[i - 1])(coordinates[i]).coordinates;
-      for (j = 0, m = resamples.length; ++j < m;) resampled.push(resamples[j]);
-    }
-
-    arc.source(origin);
-    return resampled;
-  }
-
-  circle.origin = function(x) {
-    if (!arguments.length) return origin;
-    origin = x;
-    return circle;
-  };
-
-  circle.angle = function(x) {
-    if (!arguments.length) return degrees;
-    radians = (degrees = +x) * d3_geo_radians;
-    return circle;
-  };
-
-  // Precision is specified in degrees.
-  circle.precision = function(x) {
-    if (!arguments.length) return arc.precision();
-    arc.precision(x);
-    return circle;
-  };
-
-  return circle;
-}
-d3.geo.greatArc = function() {
-  var source = d3_geo_greatArcSource,
-      target = d3_geo_greatArcTarget,
-      precision = 6 * d3_geo_radians;
-
-  function greatArc() {
-    var a = typeof source === "function" ? source.apply(this, arguments) : source,
-        b = typeof target === "function" ? target.apply(this, arguments) : target,
-        i = d3_geo_greatArcInterpolate(a, b),
-        dt = precision / i.d,
-        t = 0,
-        coordinates = [a];
-    while ((t += dt) < 1) coordinates.push(i(t));
-    coordinates.push(b);
-    return {
-      type: "LineString",
-      coordinates: coordinates
-    };
-  }
-
-  // Length returned in radians; multiply by radius for distance.
-  greatArc.distance = function() {
-    var a = typeof source === "function" ? source.apply(this, arguments) : source,
-        b = typeof target === "function" ? target.apply(this, arguments) : target;
-     return d3_geo_greatArcInterpolate(a, b).d;
-  };
-
-  greatArc.source = function(x) {
-    if (!arguments.length) return source;
-    source = x;
-    return greatArc;
-  };
-
-  greatArc.target = function(x) {
-    if (!arguments.length) return target;
-    target = x;
-    return greatArc;
-  };
-
-  // Precision is specified in degrees.
-  greatArc.precision = function(x) {
-    if (!arguments.length) return precision / d3_geo_radians;
-    precision = x * d3_geo_radians;
-    return greatArc;
-  };
-
-  return greatArc;
-};
-
-function d3_geo_greatArcSource(d) {
-  return d.source;
-}
-
-function d3_geo_greatArcTarget(d) {
-  return d.target;
-}
-
-function d3_geo_greatArcInterpolate(a, b) {
-  var x0 = a[0] * d3_geo_radians, cx0 = Math.cos(x0), sx0 = Math.sin(x0),
-      y0 = a[1] * d3_geo_radians, cy0 = Math.cos(y0), sy0 = Math.sin(y0),
-      x1 = b[0] * d3_geo_radians, cx1 = Math.cos(x1), sx1 = Math.sin(x1),
-      y1 = b[1] * d3_geo_radians, cy1 = Math.cos(y1), sy1 = Math.sin(y1),
-      d = interpolate.d = Math.acos(Math.max(-1, Math.min(1, sy0 * sy1 + cy0 * cy1 * Math.cos(x1 - x0)))),
-      sd = Math.sin(d);
-
-  // From http://williams.best.vwh.net/avform.htm#Intermediate
-  function interpolate(t) {
-    var A = Math.sin(d - (t *= d)) / sd,
-        B = Math.sin(t) / sd,
-        x = A * cy0 * cx0 + B * cy1 * cx1,
-        y = A * cy0 * sx0 + B * cy1 * sx1,
-        z = A * sy0       + B * sy1;
-    return [
-      Math.atan2(y, x) / d3_geo_radians,
-      Math.atan2(z, Math.sqrt(x * x + y * y)) / d3_geo_radians
-    ];
-  }
-
-  return interpolate;
-}
-d3.geo.greatCircle = d3.geo.circle;
-d3.geom = {};
-/**
- * Computes a contour for a given input grid function using the <a
- * href="http://en.wikipedia.org/wiki/Marching_squares">marching
- * squares</a> algorithm. Returns the contour polygon as an array of points.
- *
- * @param grid a two-input function(x, y) that returns true for values
- * inside the contour and false for values outside the contour.
- * @param start an optional starting point [x, y] on the grid.
- * @returns polygon [[x1, y1], [x2, y2], …]
- */
-d3.geom.contour = function(grid, start) {
-  var s = start || d3_geom_contourStart(grid), // starting point
-      c = [],    // contour polygon
-      x = s[0],  // current x position
-      y = s[1],  // current y position
-      dx = 0,    // next x direction
-      dy = 0,    // next y direction
-      pdx = NaN, // previous x direction
-      pdy = NaN, // previous y direction
-      i = 0;
-
-  do {
-    // determine marching squares index
-    i = 0;
-    if (grid(x-1, y-1)) i += 1;
-    if (grid(x,   y-1)) i += 2;
-    if (grid(x-1, y  )) i += 4;
-    if (grid(x,   y  )) i += 8;
-
-    // determine next direction
-    if (i === 6) {
-      dx = pdy === -1 ? -1 : 1;
-      dy = 0;
-    } else if (i === 9) {
-      dx = 0;
-      dy = pdx === 1 ? -1 : 1;
-    } else {
-      dx = d3_geom_contourDx[i];
-      dy = d3_geom_contourDy[i];
-    }
-
-    // update contour polygon
-    if (dx != pdx && dy != pdy) {
-      c.push([x, y]);
-      pdx = dx;
-      pdy = dy;
-    }
-
-    x += dx;
-    y += dy;
-  } while (s[0] != x || s[1] != y);
-
-  return c;
-};
-
-// lookup tables for marching directions
-var d3_geom_contourDx = [1, 0, 1, 1,-1, 0,-1, 1,0, 0,0,0,-1, 0,-1,NaN],
-    d3_geom_contourDy = [0,-1, 0, 0, 0,-1, 0, 0,1,-1,1,1, 0,-1, 0,NaN];
-
-function d3_geom_contourStart(grid) {
-  var x = 0,
-      y = 0;
-
-  // search for a starting point; begin at origin
-  // and proceed along outward-expanding diagonals
-  while (true) {
-    if (grid(x,y)) {
-      return [x,y];
-    }
-    if (x === 0) {
-      x = y + 1;
-      y = 0;
-    } else {
-      x = x - 1;
-      y = y + 1;
-    }
-  }
-}
-/**
- * Computes the 2D convex hull of a set of points using Graham's scanning
- * algorithm. The algorithm has been implemented as described in Cormen,
- * Leiserson, and Rivest's Introduction to Algorithms. The running time of
- * this algorithm is O(n log n), where n is the number of input points.
- *
- * @param vertices [[x1, y1], [x2, y2], …]
- * @returns polygon [[x1, y1], [x2, y2], …]
- */
-d3.geom.hull = function(vertices) {
-  if (vertices.length < 3) return [];
-
-  var len = vertices.length,
-      plen = len - 1,
-      points = [],
-      stack = [],
-      i, j, h = 0, x1, y1, x2, y2, u, v, a, sp;
-
-  // find the starting ref point: leftmost point with the minimum y coord
-  for (i=1; i<len; ++i) {
-    if (vertices[i][1] < vertices[h][1]) {
-      h = i;
-    } else if (vertices[i][1] == vertices[h][1]) {
-      h = (vertices[i][0] < vertices[h][0] ? i : h);
-    }
-  }
-
-  // calculate polar angles from ref point and sort
-  for (i=0; i<len; ++i) {
-    if (i === h) continue;
-    y1 = vertices[i][1] - vertices[h][1];
-    x1 = vertices[i][0] - vertices[h][0];
-    points.push({angle: Math.atan2(y1, x1), index: i});
-  }
-  points.sort(function(a, b) { return a.angle - b.angle; });
-
-  // toss out duplicate angles
-  a = points[0].angle;
-  v = points[0].index;
-  u = 0;
-  for (i=1; i<plen; ++i) {
-    j = points[i].index;
-    if (a == points[i].angle) {
-      // keep angle for point most distant from the reference
-      x1 = vertices[v][0] - vertices[h][0];
-      y1 = vertices[v][1] - vertices[h][1];
-      x2 = vertices[j][0] - vertices[h][0];
-      y2 = vertices[j][1] - vertices[h][1];
-      if ((x1*x1 + y1*y1) >= (x2*x2 + y2*y2)) {
-        points[i].index = -1;
-      } else {
-        points[u].index = -1;
-        a = points[i].angle;
-        u = i;
-        v = j;
-      }
-    } else {
-      a = points[i].angle;
-      u = i;
-      v = j;
-    }
-  }
-
-  // initialize the stack
-  stack.push(h);
-  for (i=0, j=0; i<2; ++j) {
-    if (points[j].index !== -1) {
-      stack.push(points[j].index);
-      i++;
-    }
-  }
-  sp = stack.length;
-
-  // do graham's scan
-  for (; j<plen; ++j) {
-    if (points[j].index === -1) continue; // skip tossed out points
-    while (!d3_geom_hullCCW(stack[sp-2], stack[sp-1], points[j].index, vertices)) {
-      --sp;
-    }
-    stack[sp++] = points[j].index;
-  }
-
-  // construct the hull
-  var poly = [];
-  for (i=0; i<sp; ++i) {
-    poly.push(vertices[stack[i]]);
-  }
-  return poly;
-}
-
-// are three points in counter-clockwise order?
-function d3_geom_hullCCW(i1, i2, i3, v) {
-  var t, a, b, c, d, e, f;
-  t = v[i1]; a = t[0]; b = t[1];
-  t = v[i2]; c = t[0]; d = t[1];
-  t = v[i3]; e = t[0]; f = t[1];
-  return ((f-b)*(c-a) - (d-b)*(e-a)) > 0;
-}
-// Note: requires coordinates to be counterclockwise and convex!
-d3.geom.polygon = function(coordinates) {
-
-  coordinates.area = function() {
-    var i = 0,
-        n = coordinates.length,
-        a = coordinates[n - 1][0] * coordinates[0][1],
-        b = coordinates[n - 1][1] * coordinates[0][0];
-    while (++i < n) {
-      a += coordinates[i - 1][0] * coordinates[i][1];
-      b += coordinates[i - 1][1] * coordinates[i][0];
-    }
-    return (b - a) * .5;
-  };
-
-  coordinates.centroid = function(k) {
-    var i = -1,
-        n = coordinates.length,
-        x = 0,
-        y = 0,
-        a,
-        b = coordinates[n - 1],
-        c;
-    if (!arguments.length) k = -1 / (6 * coordinates.area());
-    while (++i < n) {
-      a = b;
-      b = coordinates[i];
-      c = a[0] * b[1] - b[0] * a[1];
-      x += (a[0] + b[0]) * c;
-      y += (a[1] + b[1]) * c;
-    }
-    return [x * k, y * k];
-  };
-
-  // The Sutherland-Hodgman clipping algorithm.
-  coordinates.clip = function(subject) {
-    var input,
-        i = -1,
-        n = coordinates.length,
-        j,
-        m,
-        a = coordinates[n - 1],
-        b,
-        c,
-        d;
-    while (++i < n) {
-      input = subject.slice();
-      subject.length = 0;
-      b = coordinates[i];
-      c = input[(m = input.length) - 1];
-      j = -1;
-      while (++j < m) {
-        d = input[j];
-        if (d3_geom_polygonInside(d, a, b)) {
-          if (!d3_geom_polygonInside(c, a, b)) {
-            subject.push(d3_geom_polygonIntersect(c, d, a, b));
-          }
-          subject.push(d);
-        } else if (d3_geom_polygonInside(c, a, b)) {
-          subject.push(d3_geom_polygonIntersect(c, d, a, b));
-        }
-        c = d;
-      }
-      a = b;
-    }
-    return subject;
-  };
-
-  return coordinates;
-};
-
-function d3_geom_polygonInside(p, a, b) {
-  return (b[0] - a[0]) * (p[1] - a[1]) < (b[1] - a[1]) * (p[0] - a[0]);
-}
-
-// Intersect two infinite lines cd and ab.
-function d3_geom_polygonIntersect(c, d, a, b) {
-  var x1 = c[0], x2 = d[0], x3 = a[0], x4 = b[0],
-      y1 = c[1], y2 = d[1], y3 = a[1], y4 = b[1],
-      x13 = x1 - x3,
-      x21 = x2 - x1,
-      x43 = x4 - x3,
-      y13 = y1 - y3,
-      y21 = y2 - y1,
-      y43 = y4 - y3,
-      ua = (x43 * y13 - y43 * x13) / (y43 * x21 - x43 * y21);
-  return [x1 + ua * x21, y1 + ua * y21];
-}
-// Adapted from Nicolas Garcia Belmonte's JIT implementation:
-// http://blog.thejit.org/2010/02/12/voronoi-tessellation/
-// http://blog.thejit.org/assets/voronoijs/voronoi.js
-// See lib/jit/LICENSE for details.
-
-// Notes:
-//
-// This implementation does not clip the returned polygons, so if you want to
-// clip them to a particular shape you will need to do that either in SVG or by
-// post-processing with d3.geom.polygon's clip method.
-//
-// If any vertices are coincident or have NaN positions, the behavior of this
-// method is undefined. Most likely invalid polygons will be returned. You
-// should filter invalid points, and consolidate coincident points, before
-// computing the tessellation.
-
-/**
- * @param vertices [[x1, y1], [x2, y2], …]
- * @returns polygons [[[x1, y1], [x2, y2], …], …]
- */
-d3.geom.voronoi = function(vertices) {
-  var polygons = vertices.map(function() { return []; });
-
-  d3_voronoi_tessellate(vertices, function(e) {
-    var s1,
-        s2,
-        x1,
-        x2,
-        y1,
-        y2;
-    if (e.a === 1 && e.b >= 0) {
-      s1 = e.ep.r;
-      s2 = e.ep.l;
-    } else {
-      s1 = e.ep.l;
-      s2 = e.ep.r;
-    }
-    if (e.a === 1) {
-      y1 = s1 ? s1.y : -1e6;
-      x1 = e.c - e.b * y1;
-      y2 = s2 ? s2.y : 1e6;
-      x2 = e.c - e.b * y2;
-    } else {
-      x1 = s1 ? s1.x : -1e6;
-      y1 = e.c - e.a * x1;
-      x2 = s2 ? s2.x : 1e6;
-      y2 = e.c - e.a * x2;
-    }
-    var v1 = [x1, y1],
-        v2 = [x2, y2];
-    polygons[e.region.l.index].push(v1, v2);
-    polygons[e.region.r.index].push(v1, v2);
-  });
-
-  // Reconnect the polygon segments into counterclockwise loops.
-  return polygons.map(function(polygon, i) {
-    var cx = vertices[i][0],
-        cy = vertices[i][1];
-    polygon.forEach(function(v) {
-      v.angle = Math.atan2(v[0] - cx, v[1] - cy);
-    });
-    return polygon.sort(function(a, b) {
-      return a.angle - b.angle;
-    }).filter(function(d, i) {
-      return !i || (d.angle - polygon[i - 1].angle > 1e-10);
-    });
-  });
-};
-
-var d3_voronoi_opposite = {"l": "r", "r": "l"};
-
-function d3_voronoi_tessellate(vertices, callback) {
-
-  var Sites = {
-    list: vertices
-      .map(function(v, i) {
-        return {
-          index: i,
-          x: v[0],
-          y: v[1]
-        };
-      })
-      .sort(function(a, b) {
-        return a.y < b.y ? -1
-          : a.y > b.y ? 1
-          : a.x < b.x ? -1
-          : a.x > b.x ? 1
-          : 0;
-      }),
-    bottomSite: null
-  };
-
-  var EdgeList = {
-    list: [],
-    leftEnd: null,
-    rightEnd: null,
-
-    init: function() {
-      EdgeList.leftEnd = EdgeList.createHalfEdge(null, "l");
-      EdgeList.rightEnd = EdgeList.createHalfEdge(null, "l");
-      EdgeList.leftEnd.r = EdgeList.rightEnd;
-      EdgeList.rightEnd.l = EdgeList.leftEnd;
-      EdgeList.list.unshift(EdgeList.leftEnd, EdgeList.rightEnd);
-    },
-
-    createHalfEdge: function(edge, side) {
-      return {
-        edge: edge,
-        side: side,
-        vertex: null,
-        "l": null,
-        "r": null
-      };
-    },
-
-    insert: function(lb, he) {
-      he.l = lb;
-      he.r = lb.r;
-      lb.r.l = he;
-      lb.r = he;
-    },
-
-    leftBound: function(p) {
-      var he = EdgeList.leftEnd;
-      do {
-        he = he.r;
-      } while (he != EdgeList.rightEnd && Geom.rightOf(he, p));
-      he = he.l;
-      return he;
-    },
-
-    del: function(he) {
-      he.l.r = he.r;
-      he.r.l = he.l;
-      he.edge = null;
-    },
-
-    right: function(he) {
-      return he.r;
-    },
-
-    left: function(he) {
-      return he.l;
-    },
-
-    leftRegion: function(he) {
-      return he.edge == null
-          ? Sites.bottomSite
-          : he.edge.region[he.side];
-    },
-
-    rightRegion: function(he) {
-      return he.edge == null
-          ? Sites.bottomSite
-          : he.edge.region[d3_voronoi_opposite[he.side]];
-    }
-  };
-
-  var Geom = {
-
-    bisect: function(s1, s2) {
-      var newEdge = {
-        region: {"l": s1, "r": s2},
-        ep: {"l": null, "r": null}
-      };
-
-      var dx = s2.x - s1.x,
-          dy = s2.y - s1.y,
-          adx = dx > 0 ? dx : -dx,
-          ady = dy > 0 ? dy : -dy;
-
-      newEdge.c = s1.x * dx + s1.y * dy
-          + (dx * dx + dy * dy) * .5;
-
-      if (adx > ady) {
-        newEdge.a = 1;
-        newEdge.b = dy / dx;
-        newEdge.c /= dx;
-      } else {
-        newEdge.b = 1;
-        newEdge.a = dx / dy;
-        newEdge.c /= dy;
-      }
-
-      return newEdge;
-    },
-
-    intersect: function(el1, el2) {
-      var e1 = el1.edge,
-          e2 = el2.edge;
-      if (!e1 || !e2 || (e1.region.r == e2.region.r)) {
-        return null;
-      }
-      var d = (e1.a * e2.b) - (e1.b * e2.a);
-      if (Math.abs(d) < 1e-10) {
-        return null;
-      }
-      var xint = (e1.c * e2.b - e2.c * e1.b) / d,
-          yint = (e2.c * e1.a - e1.c * e2.a) / d,
-          e1r = e1.region.r,
-          e2r = e2.region.r,
-          el,
-          e;
-      if ((e1r.y < e2r.y) ||
-         (e1r.y == e2r.y && e1r.x < e2r.x)) {
-        el = el1;
-        e = e1;
-      } else {
-        el = el2;
-        e = e2;
-      }
-      var rightOfSite = (xint >= e.region.r.x);
-      if ((rightOfSite && (el.side === "l")) ||
-        (!rightOfSite && (el.side === "r"))) {
-        return null;
-      }
-      return {
-        x: xint,
-        y: yint
-      };
-    },
-
-    rightOf: function(he, p) {
-      var e = he.edge,
-          topsite = e.region.r,
-          rightOfSite = (p.x > topsite.x);
-
-      if (rightOfSite && (he.side === "l")) {
-        return 1;
-      }
-      if (!rightOfSite && (he.side === "r")) {
-        return 0;
-      }
-      if (e.a === 1) {
-        var dyp = p.y - topsite.y,
-            dxp = p.x - topsite.x,
-            fast = 0,
-            above = 0;
-
-        if ((!rightOfSite && (e.b < 0)) ||
-          (rightOfSite && (e.b >= 0))) {
-          above = fast = (dyp >= e.b * dxp);
-        } else {
-          above = ((p.x + p.y * e.b) > e.c);
-          if (e.b < 0) {
-            above = !above;
-          }
-          if (!above) {
-            fast = 1;
-          }
-        }
-        if (!fast) {
-          var dxs = topsite.x - e.region.l.x;
-          above = (e.b * (dxp * dxp - dyp * dyp)) <
-            (dxs * dyp * (1 + 2 * dxp / dxs + e.b * e.b));
-
-          if (e.b < 0) {
-            above = !above;
-          }
-        }
-      } else /* e.b == 1 */ {
-        var yl = e.c - e.a * p.x,
-            t1 = p.y - yl,
-            t2 = p.x - topsite.x,
-            t3 = yl - topsite.y;
-
-        above = (t1 * t1) > (t2 * t2 + t3 * t3);
-      }
-      return he.side === "l" ? above : !above;
-    },
-
-    endPoint: function(edge, side, site) {
-      edge.ep[side] = site;
-      if (!edge.ep[d3_voronoi_opposite[side]]) return;
-      callback(edge);
-    },
-
-    distance: function(s, t) {
-      var dx = s.x - t.x,
-          dy = s.y - t.y;
-      return Math.sqrt(dx * dx + dy * dy);
-    }
-  };
-
-  var EventQueue = {
-    list: [],
-
-    insert: function(he, site, offset) {
-      he.vertex = site;
-      he.ystar = site.y + offset;
-      for (var i=0, list=EventQueue.list, l=list.length; i<l; i++) {
-        var next = list[i];
-        if (he.ystar > next.ystar ||
-          (he.ystar == next.ystar &&
-          site.x > next.vertex.x)) {
-          continue;
-        } else {
-          break;
-        }
-      }
-      list.splice(i, 0, he);
-    },
-
-    del: function(he) {
-      for (var i=0, ls=EventQueue.list, l=ls.length; i<l && (ls[i] != he); ++i) {}
-      ls.splice(i, 1);
-    },
-
-    empty: function() { return EventQueue.list.length === 0; },
-
-    nextEvent: function(he) {
-      for (var i=0, ls=EventQueue.list, l=ls.length; i<l; ++i) {
-        if (ls[i] == he) return ls[i+1];
-      }
-      return null;
-    },
-
-    min: function() {
-      var elem = EventQueue.list[0];
-      return {
-        x: elem.vertex.x,
-        y: elem.ystar
-      };
-    },
-
-    extractMin: function() {
-      return EventQueue.list.shift();
-    }
-  };
-
-  EdgeList.init();
-  Sites.bottomSite = Sites.list.shift();
-
-  var newSite = Sites.list.shift(), newIntStar;
-  var lbnd, rbnd, llbnd, rrbnd, bisector;
-  var bot, top, temp, p, v;
-  var e, pm;
-
-  while (true) {
-    if (!EventQueue.empty()) {
-      newIntStar = EventQueue.min();
-    }
-    if (newSite && (EventQueue.empty()
-      || newSite.y < newIntStar.y
-      || (newSite.y == newIntStar.y
-      && newSite.x < newIntStar.x))) { //new site is smallest
-      lbnd = EdgeList.leftBound(newSite);
-      rbnd = EdgeList.right(lbnd);
-      bot = EdgeList.rightRegion(lbnd);
-      e = Geom.bisect(bot, newSite);
-      bisector = EdgeList.createHalfEdge(e, "l");
-      EdgeList.insert(lbnd, bisector);
-      p = Geom.intersect(lbnd, bisector);
-      if (p) {
-        EventQueue.del(lbnd);
-        EventQueue.insert(lbnd, p, Geom.distance(p, newSite));
-      }
-      lbnd = bisector;
-      bisector = EdgeList.createHalfEdge(e, "r");
-      EdgeList.insert(lbnd, bisector);
-      p = Geom.intersect(bisector, rbnd);
-      if (p) {
-        EventQueue.insert(bisector, p, Geom.distance(p, newSite));
-      }
-      newSite = Sites.list.shift();
-    } else if (!EventQueue.empty()) { //intersection is smallest
-      lbnd = EventQueue.extractMin();
-      llbnd = EdgeList.left(lbnd);
-      rbnd = EdgeList.right(lbnd);
-      rrbnd = EdgeList.right(rbnd);
-      bot = EdgeList.leftRegion(lbnd);
-      top = EdgeList.rightRegion(rbnd);
-      v = lbnd.vertex;
-      Geom.endPoint(lbnd.edge, lbnd.side, v);
-      Geom.endPoint(rbnd.edge, rbnd.side, v);
-      EdgeList.del(lbnd);
-      EventQueue.del(rbnd);
-      EdgeList.del(rbnd);
-      pm = "l";
-      if (bot.y > top.y) {
-        temp = bot;
-        bot = top;
-        top = temp;
-        pm = "r";
-      }
-      e = Geom.bisect(bot, top);
-      bisector = EdgeList.createHalfEdge(e, pm);
-      EdgeList.insert(llbnd, bisector);
-      Geom.endPoint(e, d3_voronoi_opposite[pm], v);
-      p = Geom.intersect(llbnd, bisector);
-      if (p) {
-        EventQueue.del(llbnd);
-        EventQueue.insert(llbnd, p, Geom.distance(p, bot));
-      }
-      p = Geom.intersect(bisector, rrbnd);
-      if (p) {
-        EventQueue.insert(bisector, p, Geom.distance(p, bot));
-      }
-    } else {
-      break;
-    }
-  }//end while
-
-  for (lbnd = EdgeList.right(EdgeList.leftEnd);
-      lbnd != EdgeList.rightEnd;
-      lbnd = EdgeList.right(lbnd)) {
-    callback(lbnd.edge);
-  }
-}
-/**
-* @param vertices [[x1, y1], [x2, y2], …]
-* @returns triangles [[[x1, y1], [x2, y2], [x3, y3]], …]
- */
-d3.geom.delaunay = function(vertices) {
-  var edges = vertices.map(function() { return []; }),
-      triangles = [];
-
-  // Use the Voronoi tessellation to determine Delaunay edges.
-  d3_voronoi_tessellate(vertices, function(e) {
-    edges[e.region.l.index].push(vertices[e.region.r.index]);
-  });
-
-  // Reconnect the edges into counterclockwise triangles.
-  edges.forEach(function(edge, i) {
-    var v = vertices[i],
-        cx = v[0],
-        cy = v[1];
-    edge.forEach(function(v) {
-      v.angle = Math.atan2(v[0] - cx, v[1] - cy);
-    });
-    edge.sort(function(a, b) {
-      return a.angle - b.angle;
-    });
-    for (var j = 0, m = edge.length - 1; j < m; j++) {
-      triangles.push([v, edge[j], edge[j + 1]]);
-    }
-  });
-
-  return triangles;
-};
-// Constructs a new quadtree for the specified array of points. A quadtree is a
-// two-dimensional recursive spatial subdivision. This implementation uses
-// square partitions, dividing each square into four equally-sized squares. Each
-// point exists in a unique node; if multiple points are in the same position,
-// some points may be stored on internal nodes rather than leaf nodes. Quadtrees
-// can be used to accelerate various spatial operations, such as the Barnes-Hut
-// approximation for computing n-body forces, or collision detection.
-d3.geom.quadtree = function(points, x1, y1, x2, y2) {
-  var p,
-      i = -1,
-      n = points.length;
-
-  // Type conversion for deprecated API.
-  if (n && isNaN(points[0].x)) points = points.map(d3_geom_quadtreePoint);
-
-  // Allow bounds to be specified explicitly.
-  if (arguments.length < 5) {
-    if (arguments.length === 3) {
-      y2 = x2 = y1;
-      y1 = x1;
-    } else {
-      x1 = y1 = Infinity;
-      x2 = y2 = -Infinity;
-
-      // Compute bounds.
-      while (++i < n) {
-        p = points[i];
-        if (p.x < x1) x1 = p.x;
-        if (p.y < y1) y1 = p.y;
-        if (p.x > x2) x2 = p.x;
-        if (p.y > y2) y2 = p.y;
-      }
-
-      // Squarify the bounds.
-      var dx = x2 - x1,
-          dy = y2 - y1;
-      if (dx > dy) y2 = y1 + dx;
-      else x2 = x1 + dy;
-    }
-  }
-
-  // Recursively inserts the specified point p at the node n or one of its
-  // descendants. The bounds are defined by [x1, x2] and [y1, y2].
-  function insert(n, p, x1, y1, x2, y2) {
-    if (isNaN(p.x) || isNaN(p.y)) return; // ignore invalid points
-    if (n.leaf) {
-      var v = n.point;
-      if (v) {
-        // If the point at this leaf node is at the same position as the new
-        // point we are adding, we leave the point associated with the
-        // internal node while adding the new point to a child node. This
-        // avoids infinite recursion.
-        if ((Math.abs(v.x - p.x) + Math.abs(v.y - p.y)) < .01) {
-          insertChild(n, p, x1, y1, x2, y2);
-        } else {
-          n.point = null;
-          insertChild(n, v, x1, y1, x2, y2);
-          insertChild(n, p, x1, y1, x2, y2);
-        }
-      } else {
-        n.point = p;
-      }
-    } else {
-      insertChild(n, p, x1, y1, x2, y2);
-    }
-  }
-
-  // Recursively inserts the specified point p into a descendant of node n. The
-  // bounds are defined by [x1, x2] and [y1, y2].
-  function insertChild(n, p, x1, y1, x2, y2) {
-    // Compute the split point, and the quadrant in which to insert p.
-    var sx = (x1 + x2) * .5,
-        sy = (y1 + y2) * .5,
-        right = p.x >= sx,
-        bottom = p.y >= sy,
-        i = (bottom << 1) + right;
-
-    // Recursively insert into the child node.
-    n.leaf = false;
-    n = n.nodes[i] || (n.nodes[i] = d3_geom_quadtreeNode());
-
-    // Update the bounds as we recurse.
-    if (right) x1 = sx; else x2 = sx;
-    if (bottom) y1 = sy; else y2 = sy;
-    insert(n, p, x1, y1, x2, y2);
-  }
-
-  // Create the root node.
-  var root = d3_geom_quadtreeNode();
-
-  root.add = function(p) {
-    insert(root, p, x1, y1, x2, y2);
-  };
-
-  root.visit = function(f) {
-    d3_geom_quadtreeVisit(f, root, x1, y1, x2, y2);
-  };
-
-  // Insert all points.
-  points.forEach(root.add);
-  return root;
-};
-
-function d3_geom_quadtreeNode() {
-  return {
-    leaf: true,
-    nodes: [],
-    point: null
-  };
-}
-
-function d3_geom_quadtreeVisit(f, node, x1, y1, x2, y2) {
-  if (!f(node, x1, y1, x2, y2)) {
-    var sx = (x1 + x2) * .5,
-        sy = (y1 + y2) * .5,
-        children = node.nodes;
-    if (children[0]) d3_geom_quadtreeVisit(f, children[0], x1, y1, sx, sy);
-    if (children[1]) d3_geom_quadtreeVisit(f, children[1], sx, y1, x2, sy);
-    if (children[2]) d3_geom_quadtreeVisit(f, children[2], x1, sy, sx, y2);
-    if (children[3]) d3_geom_quadtreeVisit(f, children[3], sx, sy, x2, y2);
-  }
-}
-
-function d3_geom_quadtreePoint(p) {
-  return {
-    x: p[0],
-    y: p[1]
-  };
-}
-d3.time = {};
-
-var d3_time = Date;
-
-function d3_time_utc() {
-  this._ = new Date(arguments.length > 1
-      ? Date.UTC.apply(this, arguments)
-      : arguments[0]);
-}
-
-d3_time_utc.prototype = {
-  getDate: function() { return this._.getUTCDate(); },
-  getDay: function() { return this._.getUTCDay(); },
-  getFullYear: function() { return this._.getUTCFullYear(); },
-  getHours: function() { return this._.getUTCHours(); },
-  getMilliseconds: function() { return this._.getUTCMilliseconds(); },
-  getMinutes: function() { return this._.getUTCMinutes(); },
-  getMonth: function() { return this._.getUTCMonth(); },
-  getSeconds: function() { return this._.getUTCSeconds(); },
-  getTime: function() { return this._.getTime(); },
-  getTimezoneOffset: function() { return 0; },
-  valueOf: function() { return this._.valueOf(); },
-  setDate: function() { d3_time_prototype.setUTCDate.apply(this._, arguments); },
-  setDay: function() { d3_time_prototype.setUTCDay.apply(this._, arguments); },
-  setFullYear: function() { d3_time_prototype.setUTCFullYear.apply(this._, arguments); },
-  setHours: function() { d3_time_prototype.setUTCHours.apply(this._, arguments); },
-  setMilliseconds: function() { d3_time_prototype.setUTCMilliseconds.apply(this._, arguments); },
-  setMinutes: function() { d3_time_prototype.setUTCMinutes.apply(this._, arguments); },
-  setMonth: function() { d3_time_prototype.setUTCMonth.apply(this._, arguments); },
-  setSeconds: function() { d3_time_prototype.setUTCSeconds.apply(this._, arguments); },
-  setTime: function() { d3_time_prototype.setTime.apply(this._, arguments); }
-};
-
-var d3_time_prototype = Date.prototype;
-d3.time.format = function(template) {
-  var n = template.length;
-
-  function format(date) {
-    var string = [],
-        i = -1,
-        j = 0,
-        c,
-        f;
-    while (++i < n) {
-      if (template.charCodeAt(i) == 37) {
-        string.push(
-            template.substring(j, i),
-            (f = d3_time_formats[c = template.charAt(++i)])
-            ? f(date) : c);
-        j = i + 1;
-      }
-    }
-    string.push(template.substring(j, i));
-    return string.join("");
-  }
-
-  format.parse = function(string) {
-    var d = {y: 1900, m: 0, d: 1, H: 0, M: 0, S: 0, L: 0},
-        i = d3_time_parse(d, template, string, 0);
-    if (i != string.length) return null;
-
-    // The am-pm flag is 0 for AM, and 1 for PM.
-    if ("p" in d) d.H = d.H % 12 + d.p * 12;
-
-    var date = new d3_time();
-    date.setFullYear(d.y, d.m, d.d);
-    date.setHours(d.H, d.M, d.S, d.L);
-    return date;
-  };
-
-  format.toString = function() {
-    return template;
-  };
-
-  return format;
-};
-
-function d3_time_parse(date, template, string, j) {
-  var c,
-      p,
-      i = 0,
-      n = template.length,
-      m = string.length;
-  while (i < n) {
-    if (j >= m) return -1;
-    c = template.charCodeAt(i++);
-    if (c == 37) {
-      p = d3_time_parsers[template.charAt(i++)];
-      if (!p || ((j = p(date, string, j)) < 0)) return -1;
-    } else if (c != string.charCodeAt(j++)) {
-      return -1;
-    }
-  }
-  return j;
-}
-
-var d3_time_zfill2 = d3.format("02d"),
-    d3_time_zfill3 = d3.format("03d"),
-    d3_time_zfill4 = d3.format("04d"),
-    d3_time_sfill2 = d3.format("2d");
-
-var d3_time_formats = {
-  a: function(d) { return d3_time_weekdays[d.getDay()].substring(0, 3); },
-  A: function(d) { return d3_time_weekdays[d.getDay()]; },
-  b: function(d) { return d3_time_months[d.getMonth()].substring(0, 3); },
-  B: function(d) { return d3_time_months[d.getMonth()]; },
-  c: d3.time.format("%a %b %e %H:%M:%S %Y"),
-  d: function(d) { return d3_time_zfill2(d.getDate()); },
-  e: function(d) { return d3_time_sfill2(d.getDate()); },
-  H: function(d) { return d3_time_zfill2(d.getHours()); },
-  I: function(d) { return d3_time_zfill2(d.getHours() % 12 || 12); },
-  j: function(d) { return d3_time_zfill3(1 + d3.time.dayOfYear(d)); },
-  L: function(d) { return d3_time_zfill3(d.getMilliseconds()); },
-  m: function(d) { return d3_time_zfill2(d.getMonth() + 1); },
-  M: function(d) { return d3_time_zfill2(d.getMinutes()); },
-  p: function(d) { return d.getHours() >= 12 ? "PM" : "AM"; },
-  S: function(d) { return d3_time_zfill2(d.getSeconds()); },
-  U: function(d) { return d3_time_zfill2(d3.time.sundayOfYear(d)); },
-  w: function(d) { return d.getDay(); },
-  W: function(d) { return d3_time_zfill2(d3.time.mondayOfYear(d)); },
-  x: d3.time.format("%m/%d/%y"),
-  X: d3.time.format("%H:%M:%S"),
-  y: function(d) { return d3_time_zfill2(d.getFullYear() % 100); },
-  Y: function(d) { return d3_time_zfill4(d.getFullYear() % 10000); },
-  Z: d3_time_zone,
-  "%": function(d) { return "%"; }
-};
-
-var d3_time_parsers = {
-  a: d3_time_parseWeekdayAbbrev,
-  A: d3_time_parseWeekday,
-  b: d3_time_parseMonthAbbrev,
-  B: d3_time_parseMonth,
-  c: d3_time_parseLocaleFull,
-  d: d3_time_parseDay,
-  e: d3_time_parseDay,
-  H: d3_time_parseHour24,
-  I: d3_time_parseHour24,
-  // j: function(d, s, i) { /*TODO day of year [001,366] */ return i; },
-  L: d3_time_parseMilliseconds,
-  m: d3_time_parseMonthNumber,
-  M: d3_time_parseMinutes,
-  p: d3_time_parseAmPm,
-  S: d3_time_parseSeconds,
-  // U: function(d, s, i) { /*TODO week number (sunday) [00,53] */ return i; },
-  // w: function(d, s, i) { /*TODO weekday [0,6] */ return i; },
-  // W: function(d, s, i) { /*TODO week number (monday) [00,53] */ return i; },
-  x: d3_time_parseLocaleDate,
-  X: d3_time_parseLocaleTime,
-  y: d3_time_parseYear,
-  Y: d3_time_parseFullYear
-  // ,
-  // Z: function(d, s, i) { /*TODO time zone */ return i; },
-  // "%": function(d, s, i) { /*TODO literal % */ return i; }
-};
-
-// Note: weekday is validated, but does not set the date.
-function d3_time_parseWeekdayAbbrev(date, string, i) {
-  return d3_time_weekdayAbbrevRe.test(string.substring(i, i += 3)) ? i : -1;
-}
-
-// Note: weekday is validated, but does not set the date.
-function d3_time_parseWeekday(date, string, i) {
-  d3_time_weekdayRe.lastIndex = 0;
-  var n = d3_time_weekdayRe.exec(string.substring(i, i + 10));
-  return n ? i += n[0].length : -1;
-}
-
-var d3_time_weekdayAbbrevRe = /^(?:sun|mon|tue|wed|thu|fri|sat)/i,
-    d3_time_weekdayRe = /^(?:Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday)/i;
-    d3_time_weekdays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
-
-function d3_time_parseMonthAbbrev(date, string, i) {
-  var n = d3_time_monthAbbrevLookup.get(string.substring(i, i += 3).toLowerCase());
-  return n == null ? -1 : (date.m = n, i);
-}
-
-var d3_time_monthAbbrevLookup = d3.map({
-  jan: 0,
-  feb: 1,
-  mar: 2,
-  apr: 3,
-  may: 4,
-  jun: 5,
-  jul: 6,
-  aug: 7,
-  sep: 8,
-  oct: 9,
-  nov: 10,
-  dec: 11
-});
-
-function d3_time_parseMonth(date, string, i) {
-  d3_time_monthRe.lastIndex = 0;
-  var n = d3_time_monthRe.exec(string.substring(i, i + 12));
-  return n ? (date.m = d3_time_monthLookup.get(n[0].toLowerCase()), i += n[0].length) : -1;
-}
-
-var d3_time_monthRe = /^(?:January|February|March|April|May|June|July|August|September|October|November|December)/ig;
-
-var d3_time_monthLookup = d3.map({
-  january: 0,
-  february: 1,
-  march: 2,
-  april: 3,
-  may: 4,
-  june: 5,
-  july: 6,
-  august: 7,
-  september: 8,
-  october: 9,
-  november: 10,
-  december: 11
-});
-
-var d3_time_months = [
-  "January",
-  "February",
-  "March",
-  "April",
-  "May",
-  "June",
-  "July",
-  "August",
-  "September",
-  "October",
-  "November",
-  "December"
-];
-
-function d3_time_parseLocaleFull(date, string, i) {
-  return d3_time_parse(date, d3_time_formats.c.toString(), string, i);
-}
-
-function d3_time_parseLocaleDate(date, string, i) {
-  return d3_time_parse(date, d3_time_formats.x.toString(), string, i);
-}
-
-function d3_time_parseLocaleTime(date, string, i) {
-  return d3_time_parse(date, d3_time_formats.X.toString(), string, i);
-}
-
-function d3_time_parseFullYear(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 4));
-  return n ? (date.y = +n[0], i += n[0].length) : -1;
-}
-
-function d3_time_parseYear(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-  return n ? (date.y = d3_time_century() + +n[0], i += n[0].length) : -1;
-}
-
-function d3_time_century() {
-  return ~~(new Date().getFullYear() / 1000) * 1000;
-}
-
-function d3_time_parseMonthNumber(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-  return n ? (date.m = n[0] - 1, i += n[0].length) : -1;
-}
-
-function d3_time_parseDay(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-  return n ? (date.d = +n[0], i += n[0].length) : -1;
-}
-
-// Note: we don't validate that the hour is in the range [0,23] or [1,12].
-function d3_time_parseHour24(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-  return n ? (date.H = +n[0], i += n[0].length) : -1;
-}
-
-function d3_time_parseMinutes(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-  return n ? (date.M = +n[0], i += n[0].length) : -1;
-}
-
-function d3_time_parseSeconds(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-  return n ? (date.S = +n[0], i += n[0].length) : -1;
-}
-
-function d3_time_parseMilliseconds(date, string, i) {
-  d3_time_numberRe.lastIndex = 0;
-  var n = d3_time_numberRe.exec(string.substring(i, i + 3));
-  return n ? (date.L = +n[0], i += n[0].length) : -1;
-}
-
-// Note: we don't look at the next directive.
-var d3_time_numberRe = /\s*\d+/;
-
-function d3_time_parseAmPm(date, string, i) {
-  var n = d3_time_amPmLookup.get(string.substring(i, i += 2).toLowerCase());
-  return n == null ? -1 : (date.p = n, i);
-}
-
-var d3_time_amPmLookup = d3.map({
-  am: 0,
-  pm: 1
-});
-
-// TODO table of time zone offset names?
-function d3_time_zone(d) {
-  var z = d.getTimezoneOffset(),
-      zs = z > 0 ? "-" : "+",
-      zh = ~~(Math.abs(z) / 60),
-      zm = Math.abs(z) % 60;
-  return zs + d3_time_zfill2(zh) + d3_time_zfill2(zm);
-}
-d3.time.format.utc = function(template) {
-  var local = d3.time.format(template);
-
-  function format(date) {
-    try {
-      d3_time = d3_time_utc;
-      var utc = new d3_time();
-      utc._ = date;
-      return local(utc);
-    } finally {
-      d3_time = Date;
-    }
-  }
-
-  format.parse = function(string) {
-    try {
-      d3_time = d3_time_utc;
-      var date = local.parse(string);
-      return date && date._;
-    } finally {
-      d3_time = Date;
-    }
-  };
-
-  format.toString = local.toString;
-
-  return format;
-};
-var d3_time_formatIso = d3.time.format.utc("%Y-%m-%dT%H:%M:%S.%LZ");
-
-d3.time.format.iso = Date.prototype.toISOString ? d3_time_formatIsoNative : d3_time_formatIso;
-
-function d3_time_formatIsoNative(date) {
-  return date.toISOString();
-}
-
-d3_time_formatIsoNative.parse = function(string) {
-  return new Date(string);
-};
-
-d3_time_formatIsoNative.toString = d3_time_formatIso.toString;
-function d3_time_interval(local, step, number) {
-
-  function round(date) {
-    var d0 = local(date), d1 = offset(d0, 1);
-    return date - d0 < d1 - date ? d0 : d1;
-  }
-
-  function ceil(date) {
-    step(date = local(new d3_time(date - 1)), 1);
-    return date;
-  }
-
-  function offset(date, k) {
-    step(date = new d3_time(+date), k);
-    return date;
-  }
-
-  function range(t0, t1, dt) {
-    var time = ceil(t0), times = [];
-    if (dt > 1) {
-      while (time < t1) {
-        if (!(number(time) % dt)) times.push(new Date(+time));
-        step(time, 1);
-      }
-    } else {
-      while (time < t1) times.push(new Date(+time)), step(time, 1);
-    }
-    return times;
-  }
-
-  function range_utc(t0, t1, dt) {
-    try {
-      d3_time = d3_time_utc;
-      var utc = new d3_time_utc();
-      utc._ = t0;
-      return range(utc, t1, dt);
-    } finally {
-      d3_time = Date;
-    }
-  }
-
-  local.floor = local;
-  local.round = round;
-  local.ceil = ceil;
-  local.offset = offset;
-  local.range = range;
-
-  var utc = local.utc = d3_time_interval_utc(local);
-  utc.floor = utc;
-  utc.round = d3_time_interval_utc(round);
-  utc.ceil = d3_time_interval_utc(ceil);
-  utc.offset = d3_time_interval_utc(offset);
-  utc.range = range_utc;
-
-  return local;
-}
-
-function d3_time_interval_utc(method) {
-  return function(date, k) {
-    try {
-      d3_time = d3_time_utc;
-      var utc = new d3_time_utc();
-      utc._ = date;
-      return method(utc, k)._;
-    } finally {
-      d3_time = Date;
-    }
-  };
-}
-d3.time.second = d3_time_interval(function(date) {
-  return new d3_time(Math.floor(date / 1e3) * 1e3);
-}, function(date, offset) {
-  date.setTime(date.getTime() + Math.floor(offset) * 1e3); // DST breaks setSeconds
-}, function(date) {
-  return date.getSeconds();
-});
-
-d3.time.seconds = d3.time.second.range;
-d3.time.seconds.utc = d3.time.second.utc.range;
-d3.time.minute = d3_time_interval(function(date) {
-  return new d3_time(Math.floor(date / 6e4) * 6e4);
-}, function(date, offset) {
-  date.setTime(date.getTime() + Math.floor(offset) * 6e4); // DST breaks setMinutes
-}, function(date) {
-  return date.getMinutes();
-});
-
-d3.time.minutes = d3.time.minute.range;
-d3.time.minutes.utc = d3.time.minute.utc.range;
-d3.time.hour = d3_time_interval(function(date) {
-  var timezone = date.getTimezoneOffset() / 60;
-  return new d3_time((Math.floor(date / 36e5 - timezone) + timezone) * 36e5);
-}, function(date, offset) {
-  date.setTime(date.getTime() + Math.floor(offset) * 36e5); // DST breaks setHours
-}, function(date) {
-  return date.getHours();
-});
-
-d3.time.hours = d3.time.hour.range;
-d3.time.hours.utc = d3.time.hour.utc.range;
-d3.time.day = d3_time_interval(function(date) {
-  return new d3_time(date.getFullYear(), date.getMonth(), date.getDate());
-}, function(date, offset) {
-  date.setDate(date.getDate() + offset);
-}, function(date) {
-  return date.getDate() - 1;
-});
-
-d3.time.days = d3.time.day.range;
-d3.time.days.utc = d3.time.day.utc.range;
-
-d3.time.dayOfYear = function(date) {
-  var year = d3.time.year(date);
-  return Math.floor((date - year) / 864e5 - (date.getTimezoneOffset() - year.getTimezoneOffset()) / 1440);
-};
-d3_time_weekdays.forEach(function(day, i) {
-  day = day.toLowerCase();
-  i = 7 - i;
-
-  var interval = d3.time[day] = d3_time_interval(function(date) {
-    (date = d3.time.day(date)).setDate(date.getDate() - (date.getDay() + i) % 7);
-    return date;
-  }, function(date, offset) {
-    date.setDate(date.getDate() + Math.floor(offset) * 7);
-  }, function(date) {
-    var day = d3.time.year(date).getDay();
-    return Math.floor((d3.time.dayOfYear(date) + (day + i) % 7) / 7) - (day !== i);
-  });
-
-  d3.time[day + "s"] = interval.range;
-  d3.time[day + "s"].utc = interval.utc.range;
-
-  d3.time[day + "OfYear"] = function(date) {
-    var day = d3.time.year(date).getDay();
-    return Math.floor((d3.time.dayOfYear(date) + (day + i) % 7) / 7);
-  };
-});
-
-d3.time.week = d3.time.sunday;
-d3.time.weeks = d3.time.sunday.range;
-d3.time.weeks.utc = d3.time.sunday.utc.range;
-d3.time.weekOfYear = d3.time.sundayOfYear;
-d3.time.month = d3_time_interval(function(date) {
-  return new d3_time(date.getFullYear(), date.getMonth(), 1);
-}, function(date, offset) {
-  date.setMonth(date.getMonth() + offset);
-}, function(date) {
-  return date.getMonth();
-});
-
-d3.time.months = d3.time.month.range;
-d3.time.months.utc = d3.time.month.utc.range;
-d3.time.year = d3_time_interval(function(date) {
-  return new d3_time(date.getFullYear(), 0, 1);
-}, function(date, offset) {
-  date.setFullYear(date.getFullYear() + offset);
-}, function(date) {
-  return date.getFullYear();
-});
-
-d3.time.years = d3.time.year.range;
-d3.time.years.utc = d3.time.year.utc.range;
-function d3_time_scale(linear, methods, format) {
-
-  function scale(x) {
-    return linear(x);
-  }
-
-  scale.invert = function(x) {
-    return d3_time_scaleDate(linear.invert(x));
-  };
-
-  scale.domain = function(x) {
-    if (!arguments.length) return linear.domain().map(d3_time_scaleDate);
-    linear.domain(x);
-    return scale;
-  };
-
-  scale.nice = function(m) {
-    var extent = d3_time_scaleExtent(scale.domain());
-    return scale.domain([m.floor(extent[0]), m.ceil(extent[1])]);
-  };
-
-  scale.ticks = function(m, k) {
-    var extent = d3_time_scaleExtent(scale.domain());
-    if (typeof m !== "function") {
-      var span = extent[1] - extent[0],
-          target = span / m,
-          i = d3.bisect(d3_time_scaleSteps, target);
-      if (i == d3_time_scaleSteps.length) return methods.year(extent, m);
-      if (!i) return linear.ticks(m).map(d3_time_scaleDate);
-      if (Math.log(target / d3_time_scaleSteps[i - 1]) < Math.log(d3_time_scaleSteps[i] / target)) --i;
-      m = methods[i];
-      k = m[1];
-      m = m[0].range;
-    }
-    return m(extent[0], new Date(+extent[1] + 1), k); // inclusive upper bound
-  };
-
-  scale.tickFormat = function() {
-    return format;
-  };
-
-  scale.copy = function() {
-    return d3_time_scale(linear.copy(), methods, format);
-  };
-
-  // TOOD expose d3_scale_linear_rebind?
-  return d3.rebind(scale, linear, "range", "rangeRound", "interpolate", "clamp");
-}
-
-// TODO expose d3_scaleExtent?
-function d3_time_scaleExtent(domain) {
-  var start = domain[0], stop = domain[domain.length - 1];
-  return start < stop ? [start, stop] : [stop, start];
-}
-
-function d3_time_scaleDate(t) {
-  return new Date(t);
-}
-
-function d3_time_scaleFormat(formats) {
-  return function(date) {
-    var i = formats.length - 1, f = formats[i];
-    while (!f[1](date)) f = formats[--i];
-    return f[0](date);
-  };
-}
-
-function d3_time_scaleSetYear(y) {
-  var d = new Date(y, 0, 1);
-  d.setFullYear(y); // Y2K fail
-  return d;
-}
-
-function d3_time_scaleGetYear(d) {
-  var y = d.getFullYear(),
-      d0 = d3_time_scaleSetYear(y),
-      d1 = d3_time_scaleSetYear(y + 1);
-  return y + (d - d0) / (d1 - d0);
-}
-
-var d3_time_scaleSteps = [
-  1e3,    // 1-second
-  5e3,    // 5-second
-  15e3,   // 15-second
-  3e4,    // 30-second
-  6e4,    // 1-minute
-  3e5,    // 5-minute
-  9e5,    // 15-minute
-  18e5,   // 30-minute
-  36e5,   // 1-hour
-  108e5,  // 3-hour
-  216e5,  // 6-hour
-  432e5,  // 12-hour
-  864e5,  // 1-day
-  1728e5, // 2-day
-  6048e5, // 1-week
-  2592e6, // 1-month
-  7776e6, // 3-month
-  31536e6 // 1-year
-];
-
-var d3_time_scaleLocalMethods = [
-  [d3.time.second, 1],
-  [d3.time.second, 5],
-  [d3.time.second, 15],
-  [d3.time.second, 30],
-  [d3.time.minute, 1],
-  [d3.time.minute, 5],
-  [d3.time.minute, 15],
-  [d3.time.minute, 30],
-  [d3.time.hour, 1],
-  [d3.time.hour, 3],
-  [d3.time.hour, 6],
-  [d3.time.hour, 12],
-  [d3.time.day, 1],
-  [d3.time.day, 2],
-  [d3.time.week, 1],
-  [d3.time.month, 1],
-  [d3.time.month, 3],
-  [d3.time.year, 1]
-];
-
-var d3_time_scaleLocalFormats = [
-  [d3.time.format("%Y"), function(d) { return true; }],
-  [d3.time.format("%B"), function(d) { return d.getMonth(); }],
-  [d3.time.format("%b %d"), function(d) { return d.getDate() != 1; }],
-  [d3.time.format("%a %d"), function(d) { return d.getDay() && d.getDate() != 1; }],
-  [d3.time.format("%I %p"), function(d) { return d.getHours(); }],
-  [d3.time.format("%I:%M"), function(d) { return d.getMinutes(); }],
-  [d3.time.format(":%S"), function(d) { return d.getSeconds(); }],
-  [d3.time.format(".%L"), function(d) { return d.getMilliseconds(); }]
-];
-
-var d3_time_scaleLinear = d3.scale.linear(),
-    d3_time_scaleLocalFormat = d3_time_scaleFormat(d3_time_scaleLocalFormats);
-
-d3_time_scaleLocalMethods.year = function(extent, m) {
-  return d3_time_scaleLinear.domain(extent.map(d3_time_scaleGetYear)).ticks(m).map(d3_time_scaleSetYear);
-};
-
-d3.time.scale = function() {
-  return d3_time_scale(d3.scale.linear(), d3_time_scaleLocalMethods, d3_time_scaleLocalFormat);
-};
-var d3_time_scaleUTCMethods = d3_time_scaleLocalMethods.map(function(m) {
-  return [m[0].utc, m[1]];
-});
-
-var d3_time_scaleUTCFormats = [
-  [d3.time.format.utc("%Y"), function(d) { return true; }],
-  [d3.time.format.utc("%B"), function(d) { return d.getUTCMonth(); }],
-  [d3.time.format.utc("%b %d"), function(d) { return d.getUTCDate() != 1; }],
-  [d3.time.format.utc("%a %d"), function(d) { return d.getUTCDay() && d.getUTCDate() != 1; }],
-  [d3.time.format.utc("%I %p"), function(d) { return d.getUTCHours(); }],
-  [d3.time.format.utc("%I:%M"), function(d) { return d.getUTCMinutes(); }],
-  [d3.time.format.utc(":%S"), function(d) { return d.getUTCSeconds(); }],
-  [d3.time.format.utc(".%L"), function(d) { return d.getUTCMilliseconds(); }]
-];
-
-var d3_time_scaleUTCFormat = d3_time_scaleFormat(d3_time_scaleUTCFormats);
-
-function d3_time_scaleUTCSetYear(y) {
-  var d = new Date(Date.UTC(y, 0, 1));
-  d.setUTCFullYear(y); // Y2K fail
-  return d;
-}
-
-function d3_time_scaleUTCGetYear(d) {
-  var y = d.getUTCFullYear(),
-      d0 = d3_time_scaleUTCSetYear(y),
-      d1 = d3_time_scaleUTCSetYear(y + 1);
-  return y + (d - d0) / (d1 - d0);
-}
-
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-	}
-};
-
-        /* BEGIN contents of icicle.js */
-        /*
- * icicle.js: implements icicle visualization for stacks
- */
-
-/* Configuration */
-var svSvgWidth = null;		/* image width (null to auto-compute) */
-var svSvgHeight = null;		/* image height (null to auto-compute) */
-var svAxisLabelWidth = 45;	/* width of axis labels */
-var svChartWidth = null;	/* width of chart part of image */
-var svChartHeight = null;	/* height of chart part of image */
-var svGrowDown = false;		/* if true, stacks are drawn growing down */
-var svTransitionTime = 2000;	/* time for transition */
-var svCornerPixels = 3;		/* radius of rounded corners */
-var svTextPaddingLeft = 5;	/* padding-left on rectangle labels */
-var svTextPaddingRight = 10;	/* pading-right on rectangle labels */
-var svTextPaddingTop = '1.2em';	/* padding-top on rectangle labels */
-var svColorMode = 'mono';	/* coloring mode */
-var svDetailMode = 'popout';	/* detail display mode ("zoom" or "popout") */
-
-/* Program state */
-var svRawData;			/* raw data, filled in by wrapper code */
-var svTooltipBox;		/* tooltip box (D3 selection) */
-var svPopoutBox;		/* popout detail box (D3 selection) */
-var svFlameGraph;		/* main flame graph object */
-var svContext = {
-	'detailClose': svDetailClose,
-	'detailOpen': svDetailOpen,
-	'mouseout': function () {
-		svTooltipBox.text('').style('opacity', null);
-	},
-	'mouseover': function (d, det) {
-		var text, left, top;
-
-		/* escape the key */
-		svTooltipBox.text(det['label']);
-		text = svTooltipBox.html();
-
-		text = '<strong>' + text + '</strong><br />';
-		text += '<strong>Top of stack</strong>: ' +
-		    det['pctUnique'] + '% of all samples ' +
-		    '(' + det['nunique'] + ' of ' +
-		    det['nallsamples'] + ' total samples)<br />';
-		text += '<strong>On stack</strong>: ' +
-		    det['pctSamples'] + '% of all samples ' +
-		    '(' + det['nsamples'] + ' of ' +
-		    det['nallsamples'] + ' total samples)';
-
-		left = det['x'] + 'px';
-		top = (det['y'] -
-		    parseInt(svTooltipBox.style('height'), 10)) + 'px';
-		svTooltipBox.html(text);
-		svTooltipBox.style('left', left);
-		svTooltipBox.style('top', top);
-		svTooltipBox.style('opacity', 0.9);
-	}
-};
-
-window.onload = svInit;
-
-function svInit()
-{
-	svTooltipBox = d3.select('#svTooltip');
-	svPopoutBox = d3.select('#svPopout');
-
-	svFillData(svRawData);
-	svFlameGraph = new FlameGraph(d3.select('#chart'), svRawData,
-	    svSvgWidth, svSvgHeight, svContext, {
-	        'coloring': svColorMode,
-		'growDown': svGrowDown,
-		'axisLabels': true
-	    });
-}
-
-function svFillData(tree)
-{
-	var key, rem;
-
-	for (key in tree) {
-		svFillData(tree[key].svChildren);
-
-		rem = tree[key].svUnique;
-		if (rem > 0) {
-			tree[key].svChildren[''] = {
-			    'svSynthetic': true,
-			    'svUnique': rem,
-			    'svTotal': rem,
-			    'svChildren': {}
-			};
-		}
-	}
-}
-
-function svColorMono(d, det)
-{
-	if (d.data.value.svSynthetic)
-		return ('#ffffff');
-
-	var s = 20, splus = 80;
-	var sratio;
-
-	/*
-	 * This version colors the block based on its percentage contribution of
-	 * overall time.
-	 */
-	sratio = d.data.value.svUnique / det['maxUnique'];
-
-	var rh = 24;
-	var rs = (s + sratio * splus) / 100;
-	var rv = 0.95;
-	var rgb = convertHsvToRgb(rh, rs, rv);
-	return ('rgb(' + rgb.join(',') + ')');
-}
-
-function svDetailClose()
-{
-	if (svDetailMode != 'zoom') {
-		svPopoutBox.html('');
-		svPopoutBox.style('opacity', null);
-		svPopoutBox.style('z-index', null);
-	} else {
-		svFlameGraph.zoomSet({ 'x': 0, 'dx': 1, 'y': 0 });
-	}
-}
-
-/*
- * Input: "d", a D3 node from the layout, typically resembling:
- *     parent: ...,  // parent D3 node
- *     data: {
- *         key: ..., // function name
- *         value: {
- *             svTotal: ...,
- *             svUnique: ...,
- *             svChildren: ...
- *         }
- *     }
- * Output: an object describing the raw flame graph data, matching the form:
- *     "": {
- *         svTotal: ...
- *         svUnique: ...
- *         svChildren: {
- *             key1: { // function name
- *                 svTotal: ...
- *                 svUnique: ...
- *                 svChildren: ...
- *             },
- *             ...
- *         }
- *     }
- */
-function svMakeSubgraphData(d)
-{
-	/*
-	 * First, construct everything from the current node to all of its
-	 * leafs.
-	 */
-	var tree, oldtree;
-
-	tree = {};
-	tree[d.data.key] = d.data.value;
-
-	while (d.parent !== undefined) {
-		oldtree = tree;
-		tree = {};
-		tree[d.parent.data.key] = {
-		    'svUnique': d.parent.data.value.svUnique,
-		    'svTotal': d.parent.data.value.svTotal,
-		    'svChildren': oldtree
-		};
-		d = d.parent;
-	}
-
-	return (tree);
-}
-
-function svDetailOpen(d)
-{
-	if (svDetailMode != 'zoom') {
-		svPopoutBox.html('');
-		/* jsl:ignore */
-		new FlameGraph(svPopoutBox, svMakeSubgraphData(d), null, null,
-		    svContext, {
-			'coloring': svColorMode,
-			'growDown': svGrowDown
-		    });
-		/* jsl:end */
-		svPopoutBox.style('z-index', 1);
-		svPopoutBox.style('opacity', 1);
-	} else {
-		svFlameGraph.zoomSet(d);
-	}
-}
-
-/*
- * Build a flame graph rooted at the given "node" (a D3 selection) with the
- * given "rawdata" tree.  The graph will have size defined by "pwidth" and
- * "pheight".  "context" is used for notifications about UI actions.
- */
-function FlameGraph(node, rawdata, pwidth, pheight, context, options)
-{
-	var axiswidth, chartheight, rect, scale, nodeid, axis, data;
-	var fg = this;
-
-	this.fg_context = context;
-	this.fg_maxdepth = 0;
-	this.fg_maxunique = 0;
-	this.fg_depthsamples = [];
-	this.computeDepth(rawdata, 0);
-
-	if (options.axisLabels)
-		axiswidth = this.fg_axiswidth = svAxisLabelWidth;
-	else
-		axiswidth = this.fg_axiswidth = 0;
-
-	this.fg_svgwidth = pwidth !== null ? pwidth :
-	    parseInt(node.style('width'), 10);
-	this.fg_svgheight = pheight !== null ? pheight : 25 * this.fg_maxdepth;
-	this.fg_chartwidth = this.fg_svgwidth - axiswidth;
-	chartheight = this.fg_chartheight = this.fg_svgheight - axiswidth;
-
-	this.fg_xscale =
-	    d3.scale.linear().range([0, this.fg_chartwidth]);
-	this.fg_yscale =
-	    d3.scale.linear().range([0, this.fg_chartheight]);
-
-	this.fg_svg = node.append('svg:svg');
-	this.fg_svg.attr('width', this.fg_svgwidth);
-	this.fg_svg.attr('height', this.fg_svgheight);
-
-	/* Create a background rectangle that resets the view when clicked. */
-	rect = this.fg_svg.append('svg:rect');
-	rect.attr('class', 'svBackground');
-	rect.attr('width', this.fg_svgwidth);
-	rect.attr('height', this.fg_svgheight);
-	rect.attr('fill', '#ffffff');
-	rect.on('click', this.detailClose.bind(this));
-
-	/* Configure the partition layout. */
-	this.fg_part = d3.layout.partition();
-	this.fg_part.children(
-	    function (d) { return (d3.entries(d.value.svChildren)); });
-	this.fg_part.value(function (d) { return (d.value.svTotal); });
-	this.fg_part.sort(function (d1, d2) {
-		return (d1.data.key.localeCompare(d2.data.key));
-	});
-
-	/* Configure the color function. */
-	if (options.coloring == 'random') {
-		scale = d3.scale.category20c();
-		this.fg_color = function (d) { return (scale(d.data.key)); };
-	} else {
-		this.fg_color = function (d) {
-		    return (svColorMono(d, { 'maxUnique': fg.fg_maxunique }));
-		};
-	}
-
-	/* Configure the actual D3 components. */
-	nodeid = this.fg_nodeid = function (d) {
-		return (encodeURIComponent([
-		    d.data.key,
-		    fg.fg_yscale(d.y),
-		    fg.fg_xscale(d.x) ].join('@')));
-	};
-	this.fg_rectwidth = function (d) { return (fg.fg_xscale(d.dx)); };
-	this.fg_height = function (d) { return (fg.fg_yscale(d.dy)); };
-	this.fg_textwidth = function (d) {
-		return (Math.max(0, fg.fg_rectwidth(d) - svTextPaddingRight));
-	};
-	this.fg_x = function (d) {
-	    return (fg.fg_xscale(d.x) + fg.fg_axiswidth); };
-
-	if (options.growDown)
-		this.fg_y =
-		    function (d) { return (fg.fg_yscale(d.y)); };
-	else
-		this.fg_y = function (d) {
-		    return (chartheight - fg.fg_yscale(d.y) -
-		        2 * fg.fg_height(d));
-		};
-
-	data = this.fg_part(d3.entries(rawdata)[0]);
-	this.fg_rects = this.fg_svg.selectAll('rect').data(data).
-	    enter().append('svg:rect').
-	    attr('class', function (d) {
-		return (d.data.value.svSynthetic ?  'svBoxSynthetic' : 'svBox');
-	    }).
-	    attr('x', this.fg_x).
-	    attr('y', this.fg_y).
-	    attr('rx', svCornerPixels).
-	    attr('ry', svCornerPixels).
-	    attr('height', this.fg_height).
-	    attr('width', this.fg_rectwidth).
-	    attr('fill', this.fg_color).
-	    on('click', this.detailOpen.bind(this)).
-	    on('mouseover', this.mouseover.bind(this)).
-	    on('mouseout', this.mouseout.bind(this));
-	this.fg_clips = this.fg_svg.selectAll('clipPath').data(data).
-	    enter().append('svg:clipPath').
-	    attr('id', nodeid).
-	    append('svg:rect').
-	    attr('x', this.fg_x).
-	    attr('y', this.fg_y).
-	    attr('width', this.fg_textwidth).
-	    attr('height', this.fg_height);
-	this.fg_text = this.fg_svg.selectAll('text').data(data).
-	    enter().append('text').
-	    attr('class', 'svBoxLabel').
-	    attr('x', this.fg_x).
-	    attr('y', this.fg_y).
-	    attr('dx', svTextPaddingLeft).
-	    attr('dy', svTextPaddingTop).
-	    attr('clip-path', function (d) {
-		return ('url("#' + nodeid(d) + '")');
-	    }).
-	    on('click', this.detailOpen.bind(this)).
-	    on('mouseover', this.mouseover.bind(this)).
-	    on('mouseout', this.mouseout.bind(this)).
-	    text(function (d) { return (d.data.key); });
-
-	if (options.axisLabels) {
-		axis = this.fg_svg.append('text');
-		axis.attr('class', 'svYAxisLabel');
-		axis.attr('x', -this.fg_svgheight);
-		axis.attr('dx', '8em');
-		axis.attr('y', '30px');
-		axis.attr('transform', 'rotate(-90)');
-		axis.text('Call Stacks');
-
-		axis = this.fg_svg.append('text');
-		axis.attr('class', 'svYAxisLabel');
-		axis.attr('x', '30px');
-		axis.attr('dx', '8em');
-		/*
-		 * Magic constants here:
-		 *   30 is the height of the label (since we're specifying the
-		 *   top coordinate), and 25 is the height of each block
-		 *   (because there's an invisible row we want to cover up).
-		 */
-		axis.attr('y', this.fg_svgheight - 30 - 25);
-		axis.attr('width', this.fg_svgwidth - 30);
-		axis.text('Percentage of Samples');
-	}
-}
-
-FlameGraph.prototype.computeDepth = function (tree, depth)
-{
-	var key, rem;
-
-	if (depth > this.fg_maxdepth)
-		this.fg_maxdepth = depth;
-
-	if (depth >= this.fg_depthsamples.length)
-		this.fg_depthsamples[depth] = 0;
-
-	for (key in tree) {
-		if (tree[key].svUnique > this.fg_maxunique)
-			this.fg_maxunique = tree[key].svUnique;
-		this.fg_depthsamples[depth] += tree[key].svTotal;
-		this.computeDepth(tree[key].svChildren, depth + 1);
-
-		rem = tree[key].svUnique;
-		if (rem > 0 && tree[key].svChildren[''] === undefined) {
-			tree[key].svChildren[''] = {
-			    'svSynthetic': true,
-			    'svUnique': rem,
-			    'svTotal': rem,
-			    'svChildren': {}
-			};
-		}
-	}
-};
-
-FlameGraph.prototype.detailClose = function ()
-{
-	if (this.fg_context !== null)
-		this.fg_context.detailClose();
-};
-
-FlameGraph.prototype.detailOpen = function (d)
-{
-	if (!d.data.value.svSynthetic && this.fg_context !== null)
-		this.fg_context.detailOpen(d);
-};
-
-FlameGraph.prototype.mouseover = function (d)
-{
-	if (d.data.value.svSynthetic || this.fg_context === null)
-		return;
-
-	var nsamples, nunique;
-	var pctSamples, pctUnique;
-	var detail;
-	var fg = this;
-
-	nsamples = d.data.value.svTotal;
-	pctSamples = (100 * nsamples / this.fg_depthsamples[0]).toFixed(1);
-
-	nunique = d.data.value.svUnique;
-	pctUnique = (100 * nunique / this.fg_depthsamples[0]).toFixed(1);
-
-	detail = {
-	    'label': d.data.key,
-	    'nsamples': d.data.value.svTotal,
-	    'nunique': d.data.value.svUnique,
-	    'nallsamples': this.fg_depthsamples[0],
-	    'pctSamples': pctSamples,
-	    'pctUnique': pctUnique,
-	    'x': d3.event.pageX,
-	    'y': d3.event.pageY
-	};
-
-	this.fg_hoverto = setTimeout(function () {
-		fg.fg_hoverto = null;
-		fg.fg_context.mouseover(d, detail);
-	}, 500);
-};
-
-FlameGraph.prototype.mouseout = function (d)
-{
-	if (this.fg_hoverto)
-		clearTimeout(this.fg_hoverto);
-	if (this.fg_context !== null)
-		this.fg_context.mouseout(d);
-};
-
-FlameGraph.prototype.zoomSet = function (cd)
-{
-	var fg = this;
-
-	this.fg_xscale.domain([cd.x, cd.x + cd.dx]);
-	this.fg_rectwidth = function (d) {
-		return (fg.fg_xscale(d.x + d.dx) - fg.fg_xscale(d.x));
-	};
-	this.fg_textwidth = function (d) {
-		return (Math.max(0,
-		    fg.fg_xscale(d.x + d.dx) -
-		    fg.fg_xscale(d.x) - svTextPaddingRight));
-	};
-	this.fg_rects.transition().duration(svTransitionTime).
-	    attr('x', this.fg_x).
-	    attr('width', this.fg_rectwidth);
-	this.fg_clips.transition().duration(svTransitionTime).
-	    attr('x', this.fg_x).
-	    attr('width', this.fg_textwidth);
-	this.fg_text.transition().duration(svTransitionTime).
-	    attr('x', this.fg_x);
-};
-
-
-/*
- * This function is copied directly from lib/color.js.  It would be better if we
- * could share code between Node.js and web JS.
- */
-function convertHsvToRgb(h, s, v)
-{
-	var r, g, b;
-	var i;
-	var f, p, q, t;
-
-	if (s === 0) {
-		/*
-		 * A saturation of 0.0 is achromatic (grey).
-		 */
-		r = g = b = v;
-
-		return ([ Math.round(r * 255), Math.round(g * 255),
-		    Math.round(b * 255) ]);
-	}
-
-	h /= 60; // sector 0 to 5
-
-	i = Math.floor(h);
-	f = h - i; // fractional part of h
-	p = v * (1 - s);
-	q = v * (1 - s * f);
-	t = v * (1 - s * (1 - f));
-
-	switch (i) {
-		case 0:
-			r = v;
-			g = t;
-			b = p;
-			break;
-
-		case 1:
-			r = q;
-			g = v;
-			b = p;
-			break;
-
-		case 2:
-			r = p;
-			g = v;
-			b = t;
-			break;
-
-		case 3:
-			r = p;
-			g = q;
-			b = v;
-			break;
-
-		case 4:
-			r = t;
-			g = p;
-			b = v;
-			break;
-
-		default: // case 5:
-			r = v;
-			g = p;
-			b = q;
-			break;
-	}
-
-	return ([ Math.round(r * 255),
-	    Math.round(g * 255), Math.round(b * 255) ]);
-}
-
-        /* END contents of icicle.js */
-    </script>
-  </head>
-  <body>
-    <h1>Flame graph</h1>
-    <div id="info">
-      Hover over a block for summary information.  Click a block for details.
-      <a href="javascript:svDetailClose()">Reset view</a>
-      <div class="svTooltip" id="svTooltip"></div>
-    </div>
-    <div id="chart">
-      <div style="position: relative">
-      <div class="svPopout" id="svPopout">
-      </div>
-      </div>
-    </div>
-  </body>
-</html>
