I think this one has been sufficiently beaten to death. Let's put the clubs away and move on. Brett Brett M. Connolly, Ph.D. Merck & Co., Inc. MRL, Imaging Research WP26A-3000 PO Box 4 West Point, PA 19486 PH 215-652-2501 fax. 215-652-2075 e-mail. brett_connolly <@t> merck.com