Index: trunk/Ohana/src/opihi/lib.data/style_args.c
===================================================================
--- trunk/Ohana/src/opihi/lib.data/style_args.c	(revision 40549)
+++ trunk/Ohana/src/opihi/lib.data/style_args.c	(revision 40570)
@@ -55,4 +55,9 @@
     remove_argument (N, argc, argv);
   }
+  if ((N = get_argument (*argc, argv, "-op"))) {
+    remove_argument (N, argc, argv);
+    graphmode[0].alpha = atof(argv[N]);
+    remove_argument (N, argc, argv);
+  }
   if ((N = get_argument (*argc, argv, "-c"))) {
     remove_argument (N, argc, argv);