[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Univ Hawaii Manoa, Inst Astron, Honolulu, HI 96822 USA
[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[4] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
[5] Cerro Tololo Interamer Observ, La Serena, Chile
[6] Univ Washington, Dept Astron, Seattle, WA 98195 USA
[7] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[8] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[9] European So Observ, D-8046 Garching, Germany
[10] Mt Stromlo & Siding Spring Observ, Weston, Australia