diff --git a/tests/multigraph.py b/tests/multigraph.py
index f4408d7..bd37359 100644
--- a/tests/multigraph.py
+++ b/tests/multigraph.py
@@ -1,14 +1,15 @@
 """produces some snapshots opening the bloch dataset."""
 
 import datetime
+import random
+import time
+
 import matplotlib
 import matplotlib.pylab as plt
 from PyFina import getMeta, PyFina
-import random
-import time
 
 # télécharger le fichier contenant les données de Marc Bloch 2021
-# tar -xvf in the current folder
+# puis lancer tar -xvf pour décompresser
 dir = "phpfina"
 feeds = {
     "Text" : 5,
@@ -74,7 +75,7 @@ def generate_episode(start_ts):
     plt.plot(TziqNord, label = "TziqNord", color="green")
     plt.plot(TtecNord, label = "TtecNord",  color="orange")
     plt.legend(loc='upper right')
-    ax3 = plt.subplot(212, sharex=ax1)
+    plt.subplot(212, sharex=ax1)
     plt.ylabel("hot water Temp °C")
     plt.plot(TdepNord, label = "TdepNord")
     plt.plot(TretNord, label = "TretNord")