1. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2. Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
3. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
4. Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA
5. Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA
6. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
7. Departmento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
8. Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA
9. Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA
10. Departamento de Física, Facultad de Ciencias, Universidad de La Serena, Cisternas 1200, La Serena, Chile