1. Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309–0389, USA.
2. JILA, University of Colorado, Boulder, CO 80309–0440, USA.
3. Eidgenössische Technische Hochschule Zürich, Institute for Astronomy, Wolfgang-Pauli-Strasse 27, CH-8093, Zürich, Switzerland.
4. Institute for Advanced Study, School of Natural Sciences, Einstein Drive, Princeton, NJ 08540, USA.
5. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.
6. Service d’Astrophysique Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Saclay, Orme des Merisiers, FR 91191 Gif-sur-Yvette, France.
7. Department of Astronomy, Mail Code 5240, Columbia University, 550 West 120th Street, New York, NY 10027, USA.
8. NASA Goddard Space Flight Center, Code 665, Greenbelt, MD 20771, USA.
9. Department of Astronomy, Oskar Klein Centre, Stockholm University, 106 91 Stockholm, Sweden.
10. 225 Nieuwland Science, University of Notre Dame, Notre Dame, IN 46556–5670, USA.
11. Department of Physics and Astronomy, Hofstra University, Hempstead, NY 11549, USA.
12. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA.
13. Instituto Nazionale di Astrofisica, Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy.
14. Supernova Ltd, OYV #131, Northsound Road, Virgin Gorda, British Virgin Islands.
15. Department of Physics, University of Hong Kong, Pok Fu Lam Road, Hong Kong, China.
16. Department of Astronomy, University of California, Berkeley, CA 94720–3411, USA.
17. Department of Physics and Astronomy, Texas A&M University, College Station, TX 7784–4242, USA.
18. Department of Astronomy, University of Texas, Austin, TX 78712–0259, USA.