wright@astro.ucla.edu

¹ UCLA Physics & Astronomy, P.O. Box 951547, Los Angeles, CA 90095-1547, USA
² Adnet Systems, Inc., 7515 Mission Dr., Suite A100, Lanham, MD 20706, USA
³ Department of Physics & Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, USA
⁴ Code 665, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
⁵ Department of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544-0708, USA
⁶ Department of Astronomy, University of Texas, Austin, 2511 Speedway, RLM 15.306, Austin, TX 78712, USA
⁷ Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George St., Toronto, ON M5S 3H8, Canada
⁸ Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544-1001, USA
⁹ Princeton Center for Theoretical Physics, Princeton University, Princeton, NJ 08544, USA
¹⁰ Astrophysics, University of Oxford, Keble Road, Oxford, OX1 3RH, UK
¹¹ Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
¹² Columbia Astrophysics Laboratory, 550 W. 120th St., Mail Code 5247, New York, NY 10027-6902, USA
¹³ Departments of Astrophysics and Physics, KICP and EFI, University of Chicago, Chicago, IL 60637, USA
¹⁴ Department of Physics, Brown University, 182 Hope St., Providence, RI 02912-1843, USA