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diff --git a/sys/vops/lz/arlts.x b/sys/vops/lz/arlts.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ARLT -- Replace if less than.  If A[i] is less than FLOOR replace by NEWVAL.
+
+procedure arlts (a, npix, floor, newval)
+
+short	a[ARB]
+int	npix
+short	floor, newval
+int	i
+
+begin
+
+	do i = 1, npix
+	    if (a[i] < floor)
+		a[i] = newval
+end