Index: trunk/ppImage/src/ppImageDetrendPattern.c
===================================================================
--- trunk/ppImage/src/ppImageDetrendPattern.c	(revision 30835)
+++ trunk/ppImage/src/ppImageDetrendPattern.c	(revision 30860)
@@ -92,5 +92,5 @@
         *view = *inputView;
 
-	pmHDU *hdu = pmHDUFromCell(cell);
+	pmHDU *hdu = pmHDUFromChip(chip);
 	if (psMetadataLookupBool(NULL,hdu->header,"PTRN_CEL")) {
 	  psLogMsg("ppImage", PS_LOG_INFO, "Not performing cell pattern correction as it has already been done.");