diff --git a/Convert_Matlab/inst_eddies_v6.py b/Convert_Matlab/inst_eddies_v6.py
index b664723bdea7f0e6fbf84fbd0d613516f31acfd4..dca6b4fa9a2e5c3ce61aed292ef745bff0a83329 100755
--- a/Convert_Matlab/inst_eddies_v6.py
+++ b/Convert_Matlab/inst_eddies_v6.py
@@ -5,7 +5,8 @@ SHPC_anti and SHPC_cyclo. The mat files are assumed to be in v7.3
 (HDF5) format and will be converted to v6 format before being read in
 Python. The data in each input file is the set of detected
 instantaneous eddies at a given date. The second, optional argument,
-is the final date processed.
+is the final date processed. The script inst_eddies.m must be in the
+current directory at run-time.
 
 """
 
@@ -226,4 +227,4 @@ for factory in factories:
         else:
             f.write("anticyclones\n")
             
-    for k, v in factory["writers"].items(): v.close()
+    for key, v in factory["writers"].items(): v.close()
diff --git a/Overlap/report_graph.py b/Overlap/report_graph.py
index e77a55303f692a68eb9ac7f37909312c322fe513..c8e695b6b45c6909cbc2affe19b8540b61673c37 100755
--- a/Overlap/report_graph.py
+++ b/Overlap/report_graph.py
@@ -27,7 +27,7 @@ def date_eddy_to_node(d, eddy_index, e_overestim, d_init):
     identification in graph.
 
     """
-    return (d- d_init) * e_overestim + eddy_index
+    return (d - d_init) * e_overestim + eddy_index
 
 def read_eddy_graph(edgelist, shpc_dir = None):
     if os.access(edgelist, os.R_OK):