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diff --git a/sys/imio/tf/imgs3i.x b/sys/imio/tf/imgs3i.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+
+# IMGS3? -- Get a section from an apparently three dimensional image.
+
+pointer procedure imgs3i (im, x1, x2, y1, y2, z1, z2)
+
+pointer	im
+int	x1, x2, y1, y2, z1, z2
+long	vs[3], ve[3]
+pointer	imggsi(), imgl3i()
+
+begin
+	if (x1 == 1 && x2 == IM_LEN(im,1) && y1 == y2 && z1 == z2)
+	    return (imgl3i (im, y1, z1))
+	else {
+	    vs[1] = x1
+	    ve[1] = x2
+
+	    vs[2] = y1
+	    ve[2] = y2
+
+	    vs[3] = z1
+	    ve[3] = z2
+
+	    return (imggsi (im, vs, ve, 3))
+	}
+end