¹ Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637
² Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213
³ Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510
⁴ Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15620
⁵ Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85121
⁶ Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, Berkeley, CA 94720
⁷ Princeton University Observatory, Peyton Hall, Princeton, NJ 08544
⁸ Hubble Fellow
⁹ Department of Physics, New York University, 4 Washington Place, New York, NY 10003
¹⁰ Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686
¹¹ Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349
¹² Department of Physics, Yale University, P.O. Box 208101, New Haven, CT 06520
¹³ Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
¹⁴ Department of Physics of Complex Systems, Eötvös Loránd University, Pf. 32, H-1117 Budapest, Hungary
¹⁵ Institute of Astronomy, School of Science, University of Tokyo, Mitaka, Tokyo 181-0015, Japan
¹⁶ Research Center for the Early Universe, School of Science, University of Tokyo, Tokyo 113-0033, Japan
¹⁷ Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582, Japan
¹⁸ Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540
¹⁹ US Naval Observatory, 3450 Massachusetts Avenue, NW, Washington, DC 20392-5420
²⁰ Department of Physics, University of Michigan, 500 East University, Ann Arbor, MI 48109
²¹ Department of Astronomy and Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802
²² Department of Astronomy, University of Tokyo, Tokyo 113-0033, Japan