Index: trunk/Ohana/src/opihi/cmd.data/histogram.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/histogram.c	(revision 2598)
+++ trunk/Ohana/src/opihi/cmd.data/histogram.c	(revision 7917)
@@ -8,5 +8,5 @@
 
   if ((argc != 6) && (argc != 5)) {
-    fprintf (stderr, "USAGE: hist invec outvec start end [delta]\n");
+    gprint (GP_ERR, "USAGE: hist invec outvec start end [delta]\n");
     return (FALSE);
   }
@@ -18,5 +18,5 @@
  
   if ((start == end) || (delta == 0)) {
-    fprintf (stderr, "error in value: %f to %f, %f\n", start, end, delta);
+    gprint (GP_ERR, "error in value: %f to %f, %f\n", start, end, delta);
     return (FALSE);
   }