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diff --git a/sys/vops/lz/amodkd.x b/sys/vops/lz/amodkd.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# AMODK -- Compute the modulus of a vector by a constant (generic).
+
+procedure amodkd (a, b, c, npix)
+
+double	a[ARB]
+double	b
+double	c[ARB]
+int	npix, i
+
+begin
+	do i = 1, npix
+	    c[i] = mod (a[i], b)
+end