1. Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, NL-6500 GL Nijmegen, the Netherlands
2. SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands
3. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Santa Cruz de Tenerife, Spain
4. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Santa Cruz de Tenerife, Spain
5. Institute for Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
6. Department of Physics, University of Alberta, CCLS 4-183, Edmonton, AB T6G 2E1, Canada
7. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803-4001, USA
8. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
9. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
10. Department of Physics and Astronomy, Texas Tech University, box 41051, Lubbock, TX 79409-1051, USA
11. Department of Physics, Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
12. Warsaw University Astronomical Observatory, Al. Ujazdowskie 4, PL-00-478 Warszawa, Poland
13. Department of Physics and Astronomy, Michigan State University, 5678 Wilson Road, Lansing, MI 48824, USA