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diff --git a/sys/vops/ak/ahivd.x b/sys/vops/ak/ahivd.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# AHIV -- Compute the high value (maximum) of a vector.
+
+double procedure ahivd (a, npix)
+
+double	a[ARB]
+int	npix
+double	high, pixval
+int	i
+
+begin
+	high = a[1]
+
+	do i = 1, npix {
+	    pixval = a[i]
+	    if (pixval > high)
+		high = pixval
+	}
+
+	return (high)
+end