Index: branches/eam_branches/ppStack.20211015/src/ppStackLoopByPercent.c
===================================================================
--- branches/eam_branches/ppStack.20211015/src/ppStackLoopByPercent.c	(revision 41841)
+++ branches/eam_branches/ppStack.20211015/src/ppStackLoopByPercent.c	(revision 41842)
@@ -5,5 +5,6 @@
     assert(config);
 
-    // Convolve inputs (this must be called even if the convolution is turned off)
+    // Convolve inputs (this must be called even if the convolution is turned off because
+    // it performs the normalization of the inputs).  
     psTrace("ppStack", 1, "Convolving inputs to target PSF....\n");
     if (!ppStackConvolve(options, config)) {
@@ -15,6 +16,4 @@
     if (options->quality) return true; // Can't do anything else
 
-    psMetadata *recipe = psMetadataLookupMetadata(NULL, config->recipes, PPSTACK_RECIPE); // ppStack recipe
-
     // Define threading elements
     ppStackThreadData *stack = ppStackThreadDataSetup(options, config, true);
@@ -24,5 +23,5 @@
     }
 
-    // Prepare for combination
+    // Prepare for combination (define outputs, generate output cells)
     if (!ppStackCombinePrepare("PPSTACK.OUTPUT", "PPSTACK.OUTPUT.EXP", options->doBackground ? "PPSTACK.OUTPUT.BKGMODEL" : NULL, PPSTACK_FILES_STACK, stack, options, config)) {
         psError(psErrorCodeLast(), false, "Unable to prepare for combination.");