diff --git a/Analysis/report_graph.py b/Analysis/report_graph.py
index bc7a05e64571ae843d5ce64621dbd86dba8f8fd8..33dd796b4a61f6c781db2b58b539c1fcd4305dc2 100755
--- a/Analysis/report_graph.py
+++ b/Analysis/report_graph.py
@@ -37,26 +37,26 @@ def read_eddy_graph(edgelist, shp_tr_dir = None, read_interp = True):
 
             # Assuming that the directory containing the interpolated
             # eddies is in the same location as edgelist:
-            extremum = path.join(path.dirname(edgelist), "SHP_triplet",
+            extr_file = path.join(path.dirname(edgelist), "SHP_triplet",
                                  "extremum.shp")
 
-            if os.access(extremum, os.R_OK):
-                set_attribute(G, extremum)
+            if os.access(extr_file, os.R_OK):
+                set_attribute(G, extr_file)
             else:
                 print("Trying to read data on interpolated eddies but ",
-                      f"{extremum} is not readable")
+                      f"{extr_file} is not readable")
 
         if shp_tr_dir is not None:
             # Read and set attributes of Visible eddies:
-            extremum = path.join(shp_tr_dir, "extremum")
-            set_attribute(G, extremum)
+            extr_file = path.join(shp_tr_dir, "extremum")
+            set_attribute(G, extr_file)
     else:
         print(edgelist, "not readable")
 
     return G
 
-def set_attribute(G, extremum):
-    with shapefile.Reader(extremum) as s_read:
+def set_attribute(G, extr_file):
+    with shapefile.Reader(extr_file) as s_read:
         for shape_rec in s_read:
             n = (shape_rec.record.days_1950, shape_rec.record.eddy_index)
             if (shape_rec.record.valid == 1