1. Department of Physics, University of Alberta, CCIS 4-183, Edmonton, AB T6G 2E1, Canada
2. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
3. Department of Astronomy, Indiana University, 727 E. Third Street, Bloomington, IN 47405, USA
4. Department of Physics, University of Surrey, Guildford GU2 7XH, UK
5. Institute of Astronomy, National Tsing Hua University, Hsinchu 30013, Taiwan
6. Department of Astrophysics, American Museum of Natural History, Central Park West and 79th Street, New York, NY 10024-5192, USA
7. Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Concepción, Chile
8. Department of Physics and Astronomy, Bishop’s University, 2600 rue College, Sherbrooke, Québec J1M 1Z7, Canada
9. School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
10. Department of Astronomy, University of Virginia, PO Box 400325, Charlottesville, VA 22904, USA
11. Department of Physics, University of Nevada, Reno, NV 89557, USA
12. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA