Index: trunk/pstamp/src/ppstampArguments.c
===================================================================
--- trunk/pstamp/src/ppstampArguments.c	(revision 17270)
+++ trunk/pstamp/src/ppstampArguments.c	(revision 18549)
@@ -13,6 +13,6 @@
     fprintf(stderr, "USAGE: ppstamp -skycenter RA DEC -pixrange dx dy    [-file INPUT.fits] [-list INPUT.txt] OUTPUT\n");
     fprintf(stderr, "       ppstamp -skycenter RA DEC -arcrange dRA dDEC [-file INPUT.fits] [-list INPUT.txt] OUTPUT\n");
-    fprintf(stderr, "       ppstamp -pixcenter x y    -pixrange dx dy    [-chip chipname] [-file INPUT.fits] [-list INPUT.txt] OUTPUT\n");
-    fprintf(stderr, "       ppstamp -pixcenter x y    -arcrange dRA dDEC [-chip chipname] [-file INPUT.fits] [-list INPUT.txt] OUTPUT\n");
+    fprintf(stderr, "       ppstamp -pixcenter x y    -pixrange dx dy    [-class_id class_id] [-file INPUT.fits] [-list INPUT.txt] OUTPUT\n");
+    fprintf(stderr, "       ppstamp -pixcenter x y    -arcrange dRA dDEC [-class_id class_id] [-file INPUT.fits] [-list INPUT.txt] OUTPUT\n");
     fprintf(stderr, "\n");
 
@@ -21,5 +21,5 @@
     fprintf(stderr, "\n");
     fprintf(stderr, "Optional arguments:\n");
-    fprintf(stderr, "   [-chip chipName]     selects chip (only used with -pixcenter)\n");
+    fprintf(stderr, "   [-class_id class_id]     selects class_id (only used with -pixcenter)\n");
     fprintf(stderr, "   [-astrom astrom.cmp] : provide an alternative astrometry calibration\n");
     fprintf(stderr, "\n");
@@ -71,5 +71,5 @@
     }
 
-    if ((argnum = psArgumentGet(argc, argv, "-chip"))) {
+    if ((argnum = psArgumentGet(argc, argv, "-class_id"))) {
         psArgumentRemove(argnum, &argc, argv);
         options->chipName = psStringCopy(argv[argnum]);