Index: trunk/ppMerge/src/ppMergeFiles.c
===================================================================
--- trunk/ppMerge/src/ppMergeFiles.c	(revision 18756)
+++ trunk/ppMerge/src/ppMergeFiles.c	(revision 20887)
@@ -58,4 +58,11 @@
         }
         psFree(fileView);
+
+        // Read the headers, so we can have the concepts available
+        pmCell *cell = pmFPAviewThisCell(view, input->fpa); // Cell of interest
+        if (!pmCellReadHeaderSet(cell, input->fits, config)) {
+            psError(PS_ERR_UNKNOWN, false, "Unable to read headers for image %d", num);
+            return false;
+        }
     }
     bool mdok;          // Status of MD lookup