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diff --git a/sys/vops/lz/asubkr.x b/sys/vops/lz/asubkr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ASUBK -- Subtract a constant from a vector (generic).
+
+procedure asubkr (a, b, c, npix)
+
+real	a[ARB]
+real	b
+real	c[ARB]
+int	npix, i
+
+begin
+	do i = 1, npix
+	    c[i] = a[i] - b
+end