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diff --git a/sys/vops/lz/amagd.x b/sys/vops/lz/amagd.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# AMAG -- Return the magnitude of two vectors.
+
+procedure amagd (a, b, c, npix)
+
+double	a[ARB], b[ARB], c[ARB]
+int	npix, i
+
+begin
+	do i = 1, npix
+		c[i] = sqrt (double(a[i] ** 2) + double(b[i] ** 2))
+end