1. Department of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, UK
2. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
3. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
4. NASA/Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA
5. Department of Astronomy, University of Maryland, College Park, MD 20742, USA
6. Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, NL-1098 XH Amsterdam, the Netherlands
7. ESO, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
8. Department of Physics, Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
9. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
10. Instituto Argentino de Radioastronomía (CCT-La Plata, CONICET; CICPBA), C.C. No. 5, 1894 Villa Elisa, Argentina
11. Eureka Scientific, Inc., 2452 Delmer Street, Oakland, CA 94602, USA
12. SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands
13. NASA Marshall Space Flight Center, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805, USA
14. Universities Space Research Association, Science and Technology Institute, 320 Sparkman Drive, Huntsville, AL 35805, USA
15. Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700 AV Groningen, the Netherlands
16. MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
17. Department of Astronomy and Space Sciences, Atatürk University, Yakutiye, 25240 Erzurum, Turkey
18. Astrophysics Science Division and Joint Space-Science Institute, NASA’s Goddard Space Flight Center, Greenbelt, MD 20771, USA
19. Department of Physics, Tor Vergata University of Rome, Via della Ricerca Scientifica 1, I-00133 Rome, Italy
20. INAF - Astronomical Observatory of Rome, Via Frascati 33, I-00078 Monte Porzio Catone (Rome), Italy
21. Space Sciences Laboratory, 7 Gauss Way, University of California, Berkeley, CA 94720-7450, USA
22. Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK