diff --git a/nenupy/__init__.py b/nenupy/__init__.py
index f5c5847..1bca95e 100644
--- a/nenupy/__init__.py
+++ b/nenupy/__init__.py
@@ -5,7 +5,7 @@
 __copyright__ = "Copyright 2023, nenupy"
 __credits__ = ["Alan Loh"]
 __license__ = "MIT"
-__version__ = "2.4.0"
+__version__ = "2.4.1"
 __maintainer__ = "Alan Loh"
 __email__ = "alan.loh@obspm.fr"
 
diff --git a/nenupy/io/tf.py b/nenupy/io/tf.py
index 321e41f..502ff4e 100644
--- a/nenupy/io/tf.py
+++ b/nenupy/io/tf.py
@@ -329,8 +329,10 @@ def _select_data(self):
         # Get the closest time index within each of the two bounding blocks
         dt_sec = self.dt.to_value(u.s)
         time_idx_min_in_block = int(np.round((tmin - self._block_start_unix[block_idx_min])/dt_sec))
+        time_idx_min_in_block = 0 if time_idx_min_in_block < 0 else time_idx_min_in_block
         time_idx_min = block_idx_min * self._n_time_per_block + time_idx_min_in_block
         time_idx_max_in_block = int(np.round((tmax - self._block_start_unix[block_idx_max])/dt_sec))
+        time_idx_max_in_block = self._n_time_per_block - 1 if time_idx_max_in_block >= self._n_time_per_block else time_idx_max_in_block 
         time_idx_max = block_idx_max * self._n_time_per_block + time_idx_max_in_block
 
         if time_idx_min == time_idx_max:
@@ -342,7 +344,9 @@ def _select_data(self):
             block_start_time_unix=self._block_start_unix[block_idx_min:block_idx_max + 1],
             ntime_per_block=self._n_time_per_block,
             time_step_s=self.dt.to_value(u.s)
-        )[time_idx_min_in_block:-(self._n_time_per_block - time_idx_max_in_block) + 1]
+        )
+        # Cut down the first and last time blocks
+        time_unix = time_unix[time_idx_min_in_block:time_unix.size - (self._n_time_per_block - time_idx_max_in_block) + 1]
 
         log.info("\tComputing the frequency selection...")
         fmin, fmax = self.configuration.frequency_range.to_value(u.Hz)
diff --git a/nenupy/undysputed/dynspec.py b/nenupy/undysputed/dynspec.py
index 4e7ff73..6726926 100644
--- a/nenupy/undysputed/dynspec.py
+++ b/nenupy/undysputed/dynspec.py
@@ -777,7 +777,7 @@ def rotation_measure(self) -> u.Quantity:
 
     @rotation_measure.setter
     #@u.quantity_input
-    def rotation_measure(self, rm: u.Quantity[u.rad/u.m**2]) -> None:
+    def rotation_measure(self, rm: u.Quantity) -> None: # rm: u.Quantity[u.rad/u.m**2]) -> None:
         if not (rm is None):
             # if not isinstance(rm, u.Quantity):
             #     rm *= u.rad/u.m**2