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diff --git a/pkg/utilities/nttools/stxtools/od/odsetn.x b/pkg/utilities/nttools/stxtools/od/odsetn.x
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+include <imhdr.h>
+include "od.h"
+
+#---------------------------------------------------------------------------
+.help od_set_len Jun93 source
+.ih
+NAME
+od_set_len -- Set the length of data.
+.ih
+DESCRIPTION
+This sets how much data is read/written from the OD file.  For images,
+the dimensionality is changed.	For tables, it just changes how much
+is read/written; nothing is physically changed about the table.
+.endhelp
+#---------------------------------------------------------------------------
+procedure od_set_len (od, len)
+
+pointer	od			# I: OD descriptor.
+int	len			# I: New length.
+
+begin
+	OD_LEN(od) = len
+	if (OD_TYPE(od) == OD_IMAGE) {
+	    IM_LEN(OD_FD(od),1) = len
+	}
+end
+#---------------------------------------------------------------------------
+# End of od_set_len
+#---------------------------------------------------------------------------