Index: trunk/Ohana/src/opihi/cmd.data/plot.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/plot.c	(revision 7080)
+++ trunk/Ohana/src/opihi/cmd.data/plot.c	(revision 7917)
@@ -33,5 +33,5 @@
 
   if (argc != 3) {
-    fprintf (stderr, "USAGE: plot <x> <y> [style]\n");
+    gprint (GP_ERR, "USAGE: plot <x> <y> [style]\n");
     return (FALSE);
   }
@@ -51,5 +51,5 @@
   if ((yvec = SelectVector (argv[2], OLDVECTOR, TRUE)) == NULL) return (FALSE);
   if (xvec[0].Nelements != yvec[0].Nelements) {
-    fprintf (stderr, "vectors %s and %s not the same length\n", argv[1], argv[2]);
+    gprint (GP_ERR, "vectors %s and %s not the same length\n", argv[1], argv[2]);
     return (FALSE);
   }