Index: trunk/ippTools/src/stacktool.c
===================================================================
--- trunk/ippTools/src/stacktool.c	(revision 34286)
+++ trunk/ippTools/src/stacktool.c	(revision 34296)
@@ -1109,6 +1109,6 @@
     PXOPT_COPY_STR(config->args, where, "-skycell_id", "stackRun.skycell_id", "==");
     PXOPT_COPY_STR(config->args, where, "-filter", "stackRun.filter", "LIKE");
-    PXOPT_COPY_STR(config->args, where, "-label", "stackRun.label", "==");
-    PXOPT_COPY_STR(config->args, where, "-data_group", "stackRun.data_group", "LIKE");
+    pxAddLabelSearchArgs(config, where, "-label", "stackRun.label", "LIKE");
+    pxAddLabelSearchArgs(config, where, "-data_group", "stackRun.data_group", "LIKE");
     PXOPT_COPY_S16(config->args, where, "-fault", "stackSumSkyfile.fault", "==");
     PXOPT_COPY_F64(config->args, where, "-mjd_obs_begin", "stackSumSkyfile.mjd_obs", ">=");
Index: trunk/ippTools/src/stacktoolConfig.c
===================================================================
--- trunk/ippTools/src/stacktoolConfig.c	(revision 34286)
+++ trunk/ippTools/src/stacktoolConfig.c	(revision 34296)
@@ -200,6 +200,6 @@
     psMetadataAddStr(sumskyfileArgs, PS_LIST_TAIL, "-exp_name", 0,          "search by exposure name", NULL);
 #endif
-    psMetadataAddStr(sumskyfileArgs, PS_LIST_TAIL, "-label", 0,             "search by stackRun.label", NULL);
-    psMetadataAddStr(sumskyfileArgs, PS_LIST_TAIL, "-data_group", 0,        "search by stackRun.data_group (LIKE comparison)", NULL);
+    psMetadataAddStr(sumskyfileArgs, PS_LIST_TAIL, "-label", PS_META_DUPLICATE_OK,             "search by stackRun.label", NULL);
+    psMetadataAddStr(sumskyfileArgs, PS_LIST_TAIL, "-data_group", PS_META_DUPLICATE_OK,        "search by stackRun.data_group (LIKE comparison)", NULL);
     psMetadataAddStr(sumskyfileArgs, PS_LIST_TAIL, "-filter", 0,            "search by filter (LIKE comparison)", NULL);
     psMetadataAddF64(sumskyfileArgs, PS_LIST_TAIL, "-mjd_obs_begin",  0,      "search by mjd_obs (average mjd_obs of inputs <=)", NAN);