Remove intermediary variables

Note that llcrnrlat and urcrnrlat were not used.

Inst_eddies/Analysis/plot_eddy_contours.py

@@ -177,9 +177,7 @@ if __name__ == "__main__":
     args = parser.parse_args()
 
     if args.window is not None:
-        llcrnrlon, llcrnrlat, urcrnrlon, urcrnrlat = args.window
-
-        if urcrnrlon - llcrnrlon > 360:
+        if args.window[2] - args.window[0] > 360:
             sys.exit("bad values of urcrnrlon and llcrnrlon")
 
     if args.window is None or args.grid: