Index: trunk/Ohana/src/opihi/cmd.data/periodogram.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/periodogram.c	(revision 6642)
+++ trunk/Ohana/src/opihi/cmd.data/periodogram.c	(revision 7917)
@@ -17,5 +17,5 @@
 
   if (argc != 7) {
-    fprintf (stderr, "USAGE: periodogram (time) (flux) (minP) (maxP) (period) (power)\n");
+    gprint (GP_ERR, "USAGE: periodogram (time) (flux) (minP) (maxP) (period) (power)\n");
     return (FALSE);
   }
@@ -46,9 +46,9 @@
   var = var / (Npt - 1);
 
-  if (VERBOSE) fprintf (stderr, "mean: %f, var: %f, minT: %f, maxT: %f\n", mean, var, minT, maxT);
+  if (VERBOSE) gprint (GP_ERR, "mean: %f, var: %f, minT: %f, maxT: %f\n", mean, var, minT, maxT);
 
   dTime = maxT - minT;
   if (dTime == 0) {
-    fprintf (stderr, "ERROR: time range is zero\n");
+    gprint (GP_ERR, "ERROR: time range is zero\n");
     return (FALSE);
   }
@@ -101,5 +101,5 @@
     ratio = 1 + 0.1*P/dTime;
 
-    if (VERBOSE) fprintf (stderr, "tau: %f, P: %f, ratio: %f, dTime: %f, nextP: %f\n", tau, P, ratio, dTime, P*ratio);
+    if (VERBOSE) gprint (GP_ERR, "tau: %f, P: %f, ratio: %f, dTime: %f, nextP: %f\n", tau, P, ratio, dTime, P*ratio);
 
     P *= ratio;