diff --git a/EStiMo_GUI.py b/EStiMo_GUI.py
index ef3128f..047957f 100644
--- a/EStiMo_GUI.py
+++ b/EStiMo_GUI.py
@@ -319,7 +319,7 @@ class AppForm(QMainWindow):
             ch_sum = 0
             for i in range(self.second_to_analyze.shape[0]):
                 a_seg = np.zeros([2, self.second_to_analyze.shape[1]])
-                a_seg[0,:] = self.second_to_analyze[0]#*1e6
+                a_seg[0,:] = self.second_to_analyze[i]#*1e6
                 a_seg[1,:] = np.linspace(0,1,self.Fs)
                 matrix_dist = scipy.spatial.distance.cdist(a_seg, a_seg, 'euclidean')
                 ch_sum += sum(np.diagonal(matrix_dist,1))