Index: trunk/psastro/src/psastroArguments.c
===================================================================
--- trunk/psastro/src/psastroArguments.c	(revision 15562)
+++ trunk/psastro/src/psastroArguments.c	(revision 15891)
@@ -43,10 +43,16 @@
         psMetadataAddBool (config->arguments, PS_LIST_TAIL, "PSASTRO.FIX.CHIPS", PS_META_REPLACE, "", true);
     }
+    // no valid header WCS: supply from astrom model
+    if ((N = psArgumentGet (argc, argv, "-use-astrommodel"))) {
+        psArgumentRemove (N, &argc, argv);
+        psMetadataAddBool (config->arguments, PS_LIST_TAIL, "PSASTRO.USE.MODEL", PS_META_REPLACE, "", true);
+    }
     // define the reference astrometry file
-    status = pmConfigFileSetsMD (config->arguments, &argc, argv, "REF.ASTROM", "-refastrom", "-refastromlist");
+    status = pmConfigFileSetsMD (config->arguments, &argc, argv, "ASTROM.MODEL", "-astrommodel", "-astrommodellist");
     if (status) {
 	// if supplied, assume -fixchips is desired
         psMetadataAddBool (config->arguments, PS_LIST_TAIL, "PSASTRO.FIX.CHIPS", PS_META_REPLACE, "", true);
     }
+
 
     // apply mosastro mode?