Index: trunk/ppStack/src/ppStackArguments.c
===================================================================
--- trunk/ppStack/src/ppStackArguments.c	(revision 16605)
+++ trunk/ppStack/src/ppStackArguments.c	(revision 16622)
@@ -122,4 +122,6 @@
     psMetadataAddStr(arguments, PS_LIST_TAIL, "-psf-model", 0, "Model name for PSF generation", "PS_MODEL_RGAUSS");
     psMetadataAddS32(arguments, PS_LIST_TAIL, "-psf-order", 0, "Spatial order for PSF generation", 3);
+    psMetadataAddBool(arguments, PS_LIST_TAIL, "-variance", 0, "Use variance for rejection?", false);
+    psMetadataAddBool(arguments, PS_LIST_TAIL, "-safe", 0, "Play safe with small numbers of pixels to combine?", false);
 
     if (argc == 1 || !psArgumentParse(arguments, &argc, argv) || argc != 3) {
@@ -174,4 +176,16 @@
     }
 
+    if (psMetadataLookupBool(NULL, arguments, "-variance") ||
+        psMetadataLookupBool(NULL, recipe, "VARIANCE")) {
+        psMetadataAddBool(config->arguments, PS_LIST_TAIL, "VARIANCE", 0,
+                          "Use variance for rejection?", true);
+    }
+
+    if (psMetadataLookupBool(NULL, arguments, "-safe") ||
+        psMetadataLookupBool(NULL, recipe, "SAFE")) {
+        psMetadataAddBool(config->arguments, PS_LIST_TAIL, "SAFE", 0,
+                          "Play safe with small number of pixels to combine?", true);
+    }
+
     psTrace("ppStack", 1, "Done reading command-line arguments\n");
     psFree(arguments);