Apache Point Observatory 2001 Apache Point Rd PO Box 59 Sunspot, NM 88349-0059, USA Fermilab PO Box 500 (or 500 Wilson Road) Batavia, IL 60510, USA Institute for Advanced Study School of Natural Sciences Olden Lane Princeton, NJ 08540, USA Princeton University Observatory Peyton Hall Ivy Lane Princeton, NJ 08544-1001, USA The Johns Hopkins University Dept. of Physics and Astronomy, Homewood Campus 3701 San Martin Drive Baltimore, MD 21218, USA The University of Chicago Department of Astronomy and Astrophysics 5640 S. Ellis Chicago, IL 60637, USA University of Washington Astronomy Department Box 351580 Seattle, WA 98195-1580, USA US Naval Observatory Astrometry Department 3450 Mass Ave NW Washington DC 20392, USA US Naval Observatory PO Box 1149 Flagstaff, AZ 86002, USA ----------------------------------------------------------------- National Astronomical Observatory of Japan Mitaka, Tokyo 181-8588 University of Tokyo Department of Astronomy Bunkyo-ku, Tokyo 113-0033 University of Tokyo Department of Physics Bunkyo-ku, Tokyo 113-0033 University of Tokyo Institute for Cosmic Ray Research 3-2-1, Midoricho, Tanashi, Tokyo 188-8502 University of Tokyo Institute of Astronomy Mitaka, Tokyo 181-8588 Tohoku University Department of Astronomy Aoba-ku, Sendai 113 Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-8601