diff --git a/bluepyemodel/emodel_pipeline/plotting.py b/bluepyemodel/emodel_pipeline/plotting.py
index 135b0a66..66a3256e 100644
--- a/bluepyemodel/emodel_pipeline/plotting.py
+++ b/bluepyemodel/emodel_pipeline/plotting.py
@@ -399,7 +399,7 @@ def thumbnail(
         voltage = responses[trace_name]["voltage"]
     except KeyError:
         logger.warning(
-            "Could not find protocol %s in respsonses. Skipping thumbnail plotting.",
+            "Could not find protocol %s in responses. Skipping thumbnail plotting.",
             trace_name,
         )
         return None, None
@@ -675,8 +675,10 @@ def _get_fi_curve_from_evaluator(
             [efel_trace], ["Spikecount", "mean_frequency"], raise_warnings=False
         )[0]
         spike_freq_equivalent.append(1e3 * float(features["Spikecount"]) / length_step)
-        frequencies.append(features.get("mean_frequency", None))
+        mean_freq = features.get("mean_frequency", None)
+        frequencies.append(mean_freq[0] if mean_freq is not None else None)
 
+    frequencies = numpy.array(frequencies, dtype=float)
     return amps, frequencies, spike_freq_equivalent
 
 
diff --git a/bluepyemodel/model/neuron_model_configuration.py b/bluepyemodel/model/neuron_model_configuration.py
index 59de6ff3..4be3267a 100644
--- a/bluepyemodel/model/neuron_model_configuration.py
+++ b/bluepyemodel/model/neuron_model_configuration.py
@@ -36,7 +36,7 @@
     "allact": ["apical", "basal", "somatic", "axonal"],
 }
 
-global_parameters = ["v_init", "celsius", "cm", "Ra", "ena", "ek"]
+global_parameters = ["v_init", "celsius", "cm", "Ra", "ena", "ek", "eca", "eh"]
 
 
 class NeuronModelConfiguration: