Index: trunk/psastro/src/psastroUtils.c
===================================================================
--- trunk/psastro/src/psastroUtils.c	(revision 41434)
+++ trunk/psastro/src/psastroUtils.c	(revision 41536)
@@ -111,5 +111,5 @@
 
     psFree (chip->fromFPA);
-    chip->fromFPA = psPlaneTransformInvert (NULL, chip->toFPA, *region, 50);
+    chip->fromFPA = psPlaneTransformInvert (NULL, chip->toFPA, *region, 50, 4);
     psFree (region);