diff --git a/code/useful_functions.py b/code/useful_functions.py
index 3c80a0f..de46615 100644
--- a/code/useful_functions.py
+++ b/code/useful_functions.py
@@ -188,7 +188,7 @@ def extract_stim_data(stimulus):
     stim_dur = stimulus.duration
     # calculates the amplitude modulation
     amp_mod, ny_freq = AM(eodf, stim_freq)
-    return amplitude, df, eodf, stim_freq,stim_dur, amp_mod, ny_freq
+    return amplitude, df, eodf, stim_freq, stim_dur, amp_mod, ny_freq
 
 def find_exceeding_points(frequency, power, points, delta, threshold):
     """