1. Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019
2. Department of Physics, Virginia Tech, Blacksburg, VA 24061
3. Department of Astronomy, University of Washington, Seattle, WA 98195
4. Department of Astronomy, Williams College, Williamstown, MA 01267
5. Department of Physics and Astronomy, Rice University, Houston, TX 77251
6. Space Telescope Science Institute, Baltimore, MD 21218
7. GRANTECAN, Cuesta de San José s/n, E-38712, Breña Baja, La Palma, Spain
8. Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200, La Laguna, Tenerife, Spain