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