Index: trunk/ppSub/src/ppSubArguments.c
===================================================================
--- trunk/ppSub/src/ppSubArguments.c	(revision 15431)
+++ trunk/ppSub/src/ppSubArguments.c	(revision 15817)
@@ -211,4 +211,5 @@
     psMetadataAddF32(arguments, PS_LIST_TAIL, "-opt-tol", 0, "Tolerance for optimum kernel search", NAN);
     psMetadataAddS32(arguments, PS_LIST_TAIL, "-opt-order", 0, "Maximum order for optimum kernel search", -1);
+    psMetadataAddBool(arguments, PS_LIST_TAIL, "-dual", 0, "Dual convolution", false);
 
     if (argc == 1 || !psArgumentParse(arguments, &argc, argv) || argc != 4) {
@@ -287,4 +288,6 @@
     psMetadataAddBool(config->arguments, PS_LIST_TAIL, "MASK.GENERATE", 0, "Generate mask if not supplied",
                       psMetadataLookupBool(NULL, arguments, "-generate-mask"));
+    psMetadataAddBool(config->arguments, PS_LIST_TAIL, "DUAL", 0, "Dual convolution?",
+                      psMetadataLookupBool(NULL, arguments, "-dual"));
 
     // Translate the kernel type