diff --git a/plot/main.py b/plot/main.py
index a63b194..df36a68 100644
--- a/plot/main.py
+++ b/plot/main.py
@@ -7,22 +7,26 @@ nb_files = os.listdir(".." + os.sep + "export")
 
 size = len(nb_files)
 
-# main array
-averages = np.empty((size, 2))
-nb = 0
-for i in nb_files:
-    data = pd.read_csv(".." + os.sep + "export" + os.sep + i, delimiter=';').to_numpy()
-    rb = data[:, 4]
 
-    total = 0.0
-    for x in rb:
-        total = total + x
-    average = total / len(rb)
-    nb_users = i.split(".")[0]
-    averages[nb, 0] = int(nb_users)
-    averages[nb, 1] = average
-    nb += 1
+def mean_mkn() -> np.ndarray:
+    averages_mkn = np.empty((size, 2))
+    nb = 0
+    for i in nb_files:
+        data = pd.read_csv(".." + os.sep + "export" + os.sep + i, delimiter=';').to_numpy()
+        rb = data[:, 4]
 
+        total = 0.0
+        for x in rb:
+            total = total + x
+        average = total / len(rb)
+        nb_users = i.split(".")[0]
+        averages_mkn[nb, 0] = int(nb_users)
+        averages_mkn[nb, 1] = average
+        nb += 1
+    return averages_mkn
+
+
+averages = mean_mkn()
 # Data for plotting
 averages.sort(axis=0)
 x = averages[:, 0]