¹ Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA
² UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA
³ Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute Troy, NY 12180, USA
⁴ Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
⁵ McDonald Observatory and Department of Astronomy, The University of Texas, 1 University Station, C1400 Austin, TX 78712-0259, USA
⁶ Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Surrey RH5 6NT, UK
⁷ Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
⁸ Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA
⁹ Department of Astronomy, MSC 4500, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
¹⁰ Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA
¹¹ Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
¹² Department of Physics and Astronomy, Center for the Study of Cosmic Evolution, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA
¹³ Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
¹⁴ Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
¹⁵ Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
¹⁶ Department of Physics, Warwick University, Coventry CV47AL, UK
¹⁷ Astrophysikalisches Institut Potsdam An der Sternwarte 16, D-14482 Potsdam, Germany
¹⁸ Astronomisches Rechen-Institut, Zentrum für Astronomie, University of Heidelberg, Mönchhofstrasse 12-14, D-69120 Heidelberg, Germany
¹⁹ Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106, USA
²⁰ US Naval Observatory, Flagstaff Station, 10391 West Naval Observatory Road, Flagstaff, AZ 86001-8521, USA
²¹ Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA
²² Department of Astronomy and Astrophysics, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
²³ IPAC, MS 220-6, California Institute of Technology, Pasadena, CA 91125, USA
²⁴ Research School of Astronomy and Astrophysics, Australian National University, Weston, ACT 2611, Australia
²⁵ Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA
²⁶ Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
²⁷ Drexel University, Philadelphia, PA, USA
²⁸ Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA
²⁹ Departamento de Fisica y Astronomia, Facultad de Ciencias, Universidad de Valparaiso, Valparaiso, Chile
³⁰ Department of Physics and Astronomy, Austin Peay State University, P.O. Box 4608, Clarksville, TN 37040, USA
³¹ Adler Planetarium and Astronomy Museum, 1300 Lake Shore Drive, Chicago, IL 60605, USA
³² Center for Astrophysical Sciences, Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
³³ Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA
³⁴ National Centre for Radio Astrophysics, Post Bag 3, Ganeshkhind, Pune 411007, India
³⁵ Department of Physics, Texas Tech University, Lubbock, TX, USA