Index: trunk/ippTools/src/difftool.c
===================================================================
--- trunk/ippTools/src/difftool.c	(revision 29175)
+++ trunk/ippTools/src/difftool.c	(revision 29225)
@@ -1236,4 +1236,5 @@
     PXOPT_COPY_F32(config->args, warp2Where,  "-good_frac", "warpSkyfile.good_frac", ">=");
     PXOPT_COPY_STR(config->args, stackWhere, "-stack_label", "stackRun.label", "==");
+    PXOPT_COPY_STR(config->args, stackWhere, "-stack_data_group", "stackRun.data_group", "==");
 
     PXOPT_LOOKUP_STR(workdir, config->args, "-set_workdir", true, false); // required option