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diff --git a/pkg/utilities/nttools/stxtools/od/odopep.x b/pkg/utilities/nttools/stxtools/od/odopep.x
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+++ b/pkg/utilities/nttools/stxtools/od/odopep.x
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+include "od.h"
+
+#---------------------------------------------------------------------------
+.help od_open_group 11Jul95 source
+.ih
+NAME
+od_open_group -- Open another "group" of the file
+.ih
+USAGE
+call od_open_group (od, group)
+.fi
+.ih
+ARGUMENTS
+.ls od (pointer :input)
+The OD I/O descriptor.
+.le
+.ls group (int :input)
+The "group" to open.  For tables, this means the column number to open.
+.le
+.endhelp
+#---------------------------------------------------------------------------
+procedure od_open_group (od, group)
+
+pointer od                      # I:  The 1D descriptor.
+int     group                   # I:  The group to open.
+
+# Misc.
+real    rx                      # Generic.
+
+errchk	gf_opengr, mw_close, od_wcs_open
+
+begin
+        switch (OD_TYPE(od)) {
+        case OD_TABLE:
+            if (group > OD_NGRP(od))
+                call error (1, "Attempt to open non-existant column")
+            OD_GRP(od) = group
+
+        case OD_IMAGE:
+            if (group > OD_NGRP(od))
+                call error (1, "Attempt to open non-existant group")
+
+            call mw_close (OD_MW(od))
+
+            if (OD_OLD(od) != NULL)
+                call gf_opengr (OD_FD(od), group, rx, rx, OD_FD(OD_OLD(od)))
+            else
+                call gf_opengr (OD_FD(od), group, rx, rx, NULL)
+            OD_GRP(od) = group
+
+            call od_wcs_open (od)
+        }       
+end
+#---------------------------------------------------------------------------
+# End of od_open_group
+#---------------------------------------------------------------------------