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diff --git a/sys/vops/lz/alutd.x b/sys/vops/lz/alutd.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ALUT -- Map an array using table lookup.  Note that an input value of zero
+# indexes the first element of the lookup table.  No bounds checking is
+# performed.
+
+procedure alutd (a, b, npix, lut)
+
+int	a[ARB]				# input array of indices
+
+double	b[ARB]				# output data array
+double	lut[ARB]			# lookup table
+int	npix, i
+
+begin
+	do i = 1, npix
+	    b[i] = lut[a[i]+1]
+end