¹ Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580, USA
² Princeton University Observatory, Princeton, NJ 08544-1001, USA
³ Institute for Advanced Study, 1 Einstein Drive, Princeton, NJ 08540, USA
⁴ Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA
⁵ Department of Physics and Astronomy, Austin Peay State University, Box 4608, Clarksville, TN 37044, USA
⁶ Fermi National Accelerator Laboratory, Box 500, Batavia, IL 60510, USA
⁷ Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
⁸ Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
⁹ Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, Japan
¹⁰ New Mexico State University, 1320 Frenger Street, Box 30001, Las Cruces, NM 88003, USA
¹¹ Lawrence Berkeley National Laboratory, One Cyclotron Road, MS 50R5032, Berkeley, CA 94720, USA
¹² Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
¹³ University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95060, USA
¹⁴ Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
¹⁵ US Naval Observatory, Flagstaff Station, Box 1149, Flagstaff, AZ 86002, USA
¹⁶ Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106, USA
¹⁷ Apache Point Observatory, 2001 Apache Point Road, Box 59, Sunspot, NM 88349-0059, USA
¹⁸ Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
¹⁹ Astronomy and Astrophysics Center, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
²⁰ Department of Physics, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623-5603, USA