Index: trunk/Ohana/src/opihi/cmd.astro/rotcurve.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.astro/rotcurve.c	(revision 7080)
+++ trunk/Ohana/src/opihi/cmd.astro/rotcurve.c	(revision 7917)
@@ -21,5 +21,5 @@
 
   if (argc != 5) {
-    fprintf (stderr, "USAGE: rotcurve in out mask curve.txt\n");
+    gprint (GP_ERR, "USAGE: rotcurve in out mask curve.txt\n");
     return (FALSE);
   }
@@ -27,5 +27,5 @@
   f = fopen (argv[4], "r");
   if (f == (FILE *) NULL) {
-    fprintf (stderr, "can't find rotation curve data file %s\n", argv[4]);
+    gprint (GP_ERR, "can't find rotation curve data file %s\n", argv[4]);
     return (FALSE);
   }
@@ -45,5 +45,5 @@
   ny = mask[0].matrix.Naxis[1];
   if ((Nx != nx) && (Ny != ny)) {
-    fprintf (stderr, "output and mask must have same dimensions\n");
+    gprint (GP_ERR, "output and mask must have same dimensions\n");
     return (FALSE);
   }
@@ -74,8 +74,8 @@
   X = (L - Lo) / dL + Xo;
   if ((X >= Nx) || (X < 0)) {
-    fprintf (stderr, "X out of range\n");
+    gprint (GP_ERR, "X out of range\n");
     return (FALSE);
   }
-  fprintf (stderr, "L: %f (%d)\n", L, X);
+  gprint (GP_ERR, "L: %f (%d)\n", L, X);
 
   cl = cos (L*RAD_DEG);