¹ NASA Goddard Space Flight Center, Greenbelt, MD 20771
² Osservatorio Astronomico di Brera, via Brera 28, I-20121 Milan, Italy
³ Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, via G. Celoria, 16, I-20133 Milan, Italy
⁴ Agenzia Spaziale Italiana, Science Data Center, Via di Villa Grazioli, I-00198 Rome, Italy
⁵ Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, RH5 6NT Surrey, UK
⁶ Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802
⁷ Space Research Centre, University of Leicester, LE1 7RH Leicester, UK
⁸ Department of Physics and Astronomy, Sonoma State University, Rohnert Park, CA 94928-3609
⁹ Space Sciences Laboratory, University of California, Grizzly Peak at Centennial Drive, Berkeley, CA 94720-3411
¹⁰ Universities Space Research Association, 10227 Wincopin Circle, Suite 212, Columbia, MD 21044
¹¹ Istituto di Astrofisica Spaziale e Fisica Cosmica, Consiglio Nazionale delle Ricerche, Via Bassini 15, I-20133 Milan, Italy
¹² National Research Council, 2101 Constitution Avenue, NW, Washington, DC 20418
¹³ Department of Physics and Astronomy, University of Southampton, Highfield, S017 1BJ Southampton, UK
¹⁴ Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545
¹⁵ National Radio Astronomy Observatory, P.O. Box O, 1003 Lopezville Road, Socorro, NM 87801
¹⁶ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218
¹⁷ Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse Postfach 1312, D-85748 Garching, Germany
¹⁸ Astronomy Option, California Institute of Technology, MS 105-24, Pasadena, CA 91125
¹⁹ Department of Astronomy, University of Texas, RLM 15.308, Austin, TX 78712-1083
²⁰ Commissariat a l'Energie Atomique, DSM/DAPNIA/SAP, Centre d'Etudes de Saclay, F-91191 Gif Sur Yvette Cedex, France
²¹ Canadian Institute for Theoretical Astrophysics, McClennan Laboratories, University of Toronto, 60 St. George Street, Toronto ON M5S 3H8, Canada
²² Department of Astronomy, University of Maryland, College Park, MD 20742-2421
²³ L-3 Communications EER, Chantilly, VA 20151
²⁴ Department of Physics and Astronomy, University of Leicester, University Road, LE1 7RH Leicester, UK
²⁵ Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001
²⁶ Lawrence Livermore National Laboratory, University of California, P.O. Box 808, L-413, Livermore, CA 94551
²⁷ Institute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UK
²⁸ Department of Physics, University of California, Broida Hall, Building 572, Santa Barbara, CA 93106-9530
²⁹ Department of Physics and Astronomy, Rice University, MS 61, 6100 South Main, Houston, TX 77005-1892
³⁰ Osservatorio Astronomico di Roma, Sede di Monteporzio Catone, Via di Frascati, 33, I-00040 Rome, Italy
³¹ Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, 229-8510 Kanagawa, Japan
³² Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113 Tokyo, Japan
³³ Department of Physics, Saitama University, Sakura, Saitama, Japan
³⁴ Osservatorio Astronomico di Arcetri, Università degli Studi di Firenzi, Largo Enrico Fermi, 5, I-50125 Florence, Italy