Index: /trunk/ppStack/src/ppStackReadout.c
===================================================================
--- /trunk/ppStack/src/ppStackReadout.c	(revision 14466)
+++ /trunk/ppStack/src/ppStackReadout.c	(revision 14467)
@@ -42,8 +42,13 @@
     float totExposure = 0.0;            // Total exposure time
     pmReadout *templateRO = NULL;       // Template readout, for copy WCS
+    psList *fpaList = psListAlloc(NULL); // List of input FPAs, for concept averaging
+    psList *cellList = psListAlloc(NULL); // List of input cells, for concept averaging
     while ((fileItem = psMetadataGetAndIncrement(fileIter))) {
         assert(fileItem->type == PS_DATA_UNKNOWN);
         pmFPAfile *inputFile = fileItem->data.V; // An input file
         pmReadout *ro = pmFPAviewThisReadout(view, inputFile->fpa); // Corresponding readout
+
+        psListAdd(fpaList, PS_LIST_TAIL, inputFile->fpa);
+        psListAdd(cellList, PS_LIST_TAIL, ro->parent);
 
         float seeing = psMetadataLookupF32(NULL, inputFile->fpa->analysis, "PPSTACK.SEEING"); // Seeing FWHM
@@ -204,4 +209,10 @@
     }
 
+    // Copy other concepts
+    pmConceptsAverageFPAs(outFPA, fpaList);
+    pmConceptsAverageCells(outCell, cellList, NULL, NULL, true);
+    psFree(fpaList);
+    psFree(cellList);
+
     psFree(stack);
     psFree(outRO);                      // Drop reference