¹ Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001
² Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510
³ Department of Physics, University of Michigan, 500 East University, Ann Arbor, MI 48109-1120
⁴ Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195
⁵ Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686
⁶ US Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002
⁷ Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637
⁸ Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349
⁹ Department of Physics of Complex Systems, Eötvös University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
¹⁰ Department of Astronomy and Research Center for the Early Universe, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
¹¹ Institute for Cosmic Ray Research, University of Tokyo, 3-2-1 Midori, Tanashi, Tokyo 188-8502, Japan
¹² Institute for Advanced Study, Olden Lane, Princeton, NJ 08540-0631
¹³ US Naval Observatory, 3450 Massachusetts Avenue, NW, Washington, DC 20392-5420
¹⁴ Remote Sensing Division, Code 7215, Naval Research Laboratory, 4555 Overlook Avenue, SW, Washington, DC 20375
¹⁵ Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180-3590
¹⁶ Department of Astronomy and Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802
¹⁷ Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
¹⁸ National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan