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diff --git a/sys/vops/lz/asumx.x b/sys/vops/lz/asumx.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ASUM -- Vector sum.  Take care to prevent integer overflow by returning
+# a floating point sum.
+
+complex procedure asumx (a, npix)
+
+complex	a[ARB]
+int	npix
+int	i
+
+complex	sum
+
+begin
+	sum = (0.0,0.0)
+	do i = 1, npix
+	    sum = sum + a[i]
+	
+	return (sum)
+end