1. Institute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UK
2. European Space Agency (ESA), European Space Astronomy Centre (ESAC), E-28691 Villanueva de la Cañada, Madrid, Spain
3. Department of Physics and Astronomy, Wayne State University, 666 W, Hancock Street, Detroit, MI 48201, USA
4. Dr Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Sternwartstr. 7, D-96049 Bamberg, Germany
5. Department of Astronomy and Physics, Saint Mary’s University, 923 Robie Street, Halifax, NS, B3H 3C3, Canada
6. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA
7. Department of Physics, Montana State University, Bozeman, MT 59717-3840, USA
8. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warsaw, Poland
9. Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA
10. Department of Astronomy, University of Michigan, 1085 South University, Ann Arbor, MI 48109, USA
11. Centro de Astrobiología (INTA–CSIC), Dep. de Astrofísica, ESAC campus, E-28692 Villanueva de la Cañada, Spain
12. Kavli Institute of Particle Astrophysics and Cosmology, Standford University, 452 Lomita Mall, Stanford, CA 94305, USA