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diff --git a/sys/vops/lz/arcpr.x b/sys/vops/lz/arcpr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ARCP -- Reciprocal of a constant divided by a vector.  No divide by zero
+# checking is performed.
+
+procedure arcpr (a, b, c, npix)
+
+real	a		# constant numerator
+real	b[ARB]		# vector denominator
+real	c[ARB]		# output vector
+int	npix
+int	i
+
+begin
+	if (a == 0.0) {
+	    call aclrr (c, npix)
+	} else if (a == 1.0) {
+	    do i = 1, npix
+		c[i] = 1.0 / b[i]
+	} else {
+	    do i = 1, npix
+		c[i] = a / b[i]
+	}
+end