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diff --git a/sys/vops/lz/anegd.x b/sys/vops/lz/anegd.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ANEG -- Compute the arithmetic negation of a vector (generic).
+
+procedure anegd (a, b, npix)
+
+double	a[ARB], b[ARB]
+int	npix, i
+
+begin
+	do i = 1, npix
+	    b[i] = -a[i]
+end