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diff --git a/sys/vops/lz/amovl.x b/sys/vops/lz/amovl.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# AMOV -- Copy a vector (generic).  The operation is carried out in such
+# a way that the result is the same whether or not the output vector
+# overlaps the input vector.
+
+procedure amovl (a, b, npix)
+
+long	a[ARB], b[ARB]
+int	npix, i, a_first, b_first
+
+begin
+	call zlocva (a, a_first)
+	call zlocva (b, b_first)
+
+	if (a_first == b_first)
+	    return
+
+	if (a_first < b_first) {
+	    do i = npix, 1, -1
+		b[i] = a[i]
+	} else {
+	    do i = 1, npix
+		b[i] = a[i]
+	}
+end