¹ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218
² Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686
³ Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802
⁴ Institut d'Astrophysique de Paris-CNRS, 98bis Boulevard Arago, F-75014 Paris, France
⁵ European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
⁶ Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520
⁷ Palomar Observatory, California Institute of Technology, Mail Stop 105-24, Pasadena, CA 91125
⁸ Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, Trieste I-34131, Italy
⁹ NASA Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Code 681, Greenbelt, MD 20771
¹⁰ Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 169-506, Pasadena, CA 91109
¹¹ Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching bei München, Germany
¹² Department of Physics, University of California, Davis, 1 Shields Avenue, Davis, CA 95616
¹³ European Space Agency, Space Telescope Division
¹⁴ Space Telescope European Coordinating Facility, European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
¹⁵ Department of Astronomy and Astrophysics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064
¹⁶ Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065
¹⁷ Institut für Astrophysik und Extraterrestrische Forschung, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
¹⁸ Department of Astronomy, University of California, Berkeley, Mail Code 3411, Berkeley, CA 94720
¹⁹ Department of Physics, University of Oxford, Keble Road, Oxford, OX1 3RH, UK