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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# AMED3 -- Median of three vectors.  Each output point M[i] is the median value
+# of the three input points A[i],B[i],C[i].
+
+procedure amed3i (a, b, c, m, npix)
+
+int	a[ARB], b[ARB], c[ARB]	# input vectors
+int	m[ARB]				# output vector (median)
+int	npix
+int	i
+
+begin
+	do i = 1, npix
+	    if (a[i] < b[i]) {
+		if (b[i] < c[i])		# abc
+		    m[i] = b[i]
+		else if (a[i] < c[i])		# acb
+		    m[i] = c[i]
+		else				# cab
+		    m[i] = a[i]
+	    } else {
+		if (b[i] > c[i])		# cba
+		    m[i] = b[i]
+		else if (a[i] > c[i])		# bca
+		    m[i] = c[i]
+		else				# bac
+		    m[i] = a[i]
+	    }
+end