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diff --git a/sys/vops/lz/assqs.x b/sys/vops/lz/assqs.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ASSQ -- Vector sum of squares.
+
+real procedure assqs (a, npix)
+real	sum
+
+short	a[ARB]
+int	npix
+int	i
+
+begin
+	sum = 0
+	do i = 1, npix
+	    sum = sum + (a[i] ** 2)
+	
+	return (sum)
+end