¹ Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
² Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI 96822, USA
³ National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85726, USA
⁴ California Institute of Technology, Division of Physics, Mathematics, and Astronomy, MS 320-47, Pasadena, CA 91125, USA
⁵ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
⁶ California Institute of Technology, 1200 E California Blvd., MS 100-22, Pasadena, CA 91125, USA
⁷ Institut d'Astrophysique Spatiale, Université Paris Sud, F-91405 Osay Cedex, France
⁸ Department of Physics, Texas A&M University, 4242 TAMU, College Station, TX 77843-4242, USA
⁹ School of Physics, Monash University, Clayton, Victoria 3800, Australia
¹⁰ Department of Physics, Georgia Southern University, P.O. Box 8031, Statesboro, GA 30460, USA
¹¹ Department of Physics, University of Crete, GR-71003 Heraklion, Greece
¹² IESL/Foundation for Research and Technology-Hellas, GR-71110, Heraklion, Greece
¹³ Chercheur Associé, Observatoire de Paris, F-75014, Paris, France
¹⁴ Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
¹⁵ Spitzer Fellow.
¹⁶ Giacconi Fellow.