Index: trunk/ppStack/src/ppStackUpdateHeader.c
===================================================================
--- trunk/ppStack/src/ppStackUpdateHeader.c	(revision 31158)
+++ trunk/ppStack/src/ppStackUpdateHeader.c	(revision 34800)
@@ -6,9 +6,10 @@
 
     pmReadout *outRO = options->outRO;                                      // Output readout
+    pmReadout *expRO = options->expRO;
 
     // Propagate WCS
     bool wcsDone = false;           // Have we done the WCS?
     for (int i = 0; i < options->num && !wcsDone; i++) {
-        if (options->inputMask->data.PS_TYPE_VECTOR_MASK_DATA[i]) {
+      if ((options->inputMask)&&(options->inputMask->data.PS_TYPE_VECTOR_MASK_DATA[i])) {
             continue;
         }
@@ -123,5 +124,23 @@
 	snprintf (field, 64, "AIR_%04d", i);
 	psMetadataAddF32(hdu->header, PS_LIST_TAIL, field, PS_META_REPLACE, "input image airmass", value);
-    }	
+    }
+
+    // Copy information into expRO, because it should be there too.
+    if ((expRO)&&(expRO->parent)) {
+      pmHDU *expROhdu = pmHDUFromCell(expRO->parent);
+      if (!expROhdu->header) {
+	expROhdu->header = psMetadataAlloc();
+      }
+      expRO->parent->parent->parent->hdu->header = psMetadataCopy(expRO->parent->parent->parent->hdu->header,
+								  outRO->parent->parent->parent->hdu->header);
+      
+      expRO->parent->concepts = psMetadataCopy(expRO->parent->concepts,
+					       outRO->parent->concepts);
+      expRO->parent->parent->concepts = psMetadataCopy(expRO->parent->parent->concepts,
+						       outRO->parent->concepts);
+      expRO->parent->parent->parent->concepts = psMetadataCopy(expRO->parent->parent->parent->concepts,
+							       outRO->parent->parent->parent->concepts);
+    }
+    
     return true;
 }