Index: trunk/psModules/src/imcombine/pmSubtractionIO.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionIO.c	(revision 23370)
+++ trunk/psModules/src/imcombine/pmSubtractionIO.c	(revision 23374)
@@ -4,4 +4,5 @@
 
 #include "pmHDU.h"
+#include "pmHDUUtils.h"
 #include "pmFPA.h"
 #include "pmFPAview.h"
@@ -143,4 +144,14 @@
     psMetadata *header = psMetadataAlloc(); // Header for FITS file
 
+    pmCell *cell = ro->parent;          // Cell of interest
+    if (cell) {
+        pmChip *chip = cell->parent;    // Chip of interest
+        pmFPA *fpa = chip->parent;      // FPA of interest
+        pmHDU *hdu = pmHDUGetHighest(fpa, chip, cell); // HDU for readout
+        if (hdu) {
+            header = psMetadataCopy(header, hdu->header);
+        }
+    }
+
     // CVS tags, used to identify the version of this file (in case incompatibilities are introduced)
     psString cvsFile = psStringCopy("$RCSfile: pmSubtractionIO.c,v $");