Index: trunk/ppStack/src/ppStackArguments.c
===================================================================
--- trunk/ppStack/src/ppStackArguments.c	(revision 19172)
+++ trunk/ppStack/src/ppStackArguments.c	(revision 19231)
@@ -135,5 +135,12 @@
 {
     assert(config);
-    // bool mdok;                          // Status of MD lookup
+
+    // This capability makes things much faster when debugging
+    bool debugStack = false;            // Read old convolutions to debug the stacking?
+    int argNum = psArgumentGet(argc, argv, "-debug-stack"); // Argument number
+    if (argNum > 0) {
+        debugStack = true;
+        psArgumentRemove(argNum, &argc, argv);
+    }
 
     pmConfigFileSetsMD(config->arguments, &argc, argv, "PPSTACK.SOURCES", "-sources", NULL);
@@ -203,4 +210,7 @@
     }
 
+    psMetadataAddBool(arguments, PS_LIST_TAIL, "PPSTACK.DEBUG.STACK", 0,
+                      "Read old convolved images to debug stack?", debugStack);
+
     return true;
 }