Index: trunk/ppMerge/src/ppMergeCombine.c
===================================================================
--- trunk/ppMerge/src/ppMergeCombine.c	(revision 13880)
+++ trunk/ppMerge/src/ppMergeCombine.c	(revision 13906)
@@ -116,8 +116,16 @@
     }
     while ((chip = pmFPAviewNextChip(view, fpa, 1))) {
+        if (chip->hdu && chip->hdu->header) {
+            // Data will exist soon
+            chip->data_exists = true;
+        }
         pmChipWrite(chip, data->outFile, config->database, true, false); // Write header only
         pmCell *cell;                   // Cell of interest
         while ((cell = pmFPAviewNextCell(view, fpa, 1))) {
             cellNum++;
+            if (cell->hdu && cell->hdu->header) {
+                // Data will exist soon
+                chip->data_exists = true;
+            }
             pmCellWrite(cell, data->outFile, config->database, true); // Write header only
             pmReadout *readout = pmReadoutAlloc(cell); // Output readout of interest