1. Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, NL-1098 XH Amsterdam, the Netherlands
2. Department of Physics, Box 41051, Science Building, Texas Tech University, Lubbock, TX 79409-1051, USA
3. Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USA
4. Mathematical Sciences and STAG Research Centre, University of Southampton, Southampton SO17 1BJ, UK
5. Department of Physics, University of Alberta, CCIS 4-183, Edmonton AB T6G 2E1, Canada
6. Department of Physics & Astronomy, Wayne State University, 666 W. Hancock St, Detroit, MI 48201, USA
7. MIT Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue 37-582D, Cambridge, MA 02139, USA
8. SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands
9. Eureka Scientific, Inc., 2452 Delmer Street, Oakland, CA 94602, USA
10. Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK
11. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
12. Department of Astronomy, University of Michigan, 1085 South University Ave, Ann Arbor, MI 48109-1107, USA