sullivan@astro.utoronto.ca

¹ Department of Physics, University of Durham, South Road, Durham DH1 3LE, England, UK
² Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada
³ Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15206
⁴ Hubble Fellow
⁵ CAAUL, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
⁶ Institute of Astronomy and Astrophysics, National Observatory of Athens, I. Metaxa & B. Pavlou, Penteli, 15236 Athens, Greece
⁷ School of Physics, University of Sydney, NSW 2006, Australia
⁸ Australian Research Council, GPO Box 2702, Canberra, ACT 2601, Australia
⁹ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218