Index: trunk/ippTools/src/difftool.c
===================================================================
--- trunk/ippTools/src/difftool.c	(revision 29958)
+++ trunk/ippTools/src/difftool.c	(revision 30070)
@@ -1978,4 +1978,5 @@
     PXOPT_COPY_STR(config->args, stack2Where, "-skycell_id", "stackRun.skycell_id", "==");
     PXOPT_COPY_STR(config->args, stack1Where, "-input_label", "stackRun.label","==");
+    PXOPT_COPY_STR(config->args, stack1Where, "-input_data_group", "stackRun.data_group","==");
     PXOPT_COPY_STR(config->args, stack2Where, "-template_label", "stackRun.label","==");
     PXOPT_COPY_F32(config->args, stack1Where, "-good_frac", "stackSumSkyfile.good_frac", ">=");