1. Universitäts-Sternwarte München, Ludwig-Maximilians-Universität München, Scheinerstrasse 1, D-81679 Munich, Germany
2. Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, Giessenbachstr, D-85741 Garching, Germany
3. Dipartimento di Fisica, Università di Torino, Via P. Giuria 1, I-10125 Torino, Italy
4. Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Via P. Giuria 1, I-10125 Torino, Italy
5. Dipartimento di Fisica, Sezione di Astronomia, Università di Trieste, via Tiepolo 11, I-34143 Trieste, Italy
6. Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, via Tiepolo 11, I-34143 Trieste, Italy
7. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Via Valerio 2, I-34127 Trieste, Italy
8. Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, Spain
9. Institut d’Estudis Espacials de Catalunya (IEEC), E-08193 Barcelona, Spain
10. Berkeley Center for Cosmological Physics, Campbell Hall 341, University of California, Berkeley, CA 94720, USA
11. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str 1, D-85741 Garching, Germany
12. Institute of Cosmology & Gravitation, Dennis Sciama Building, University of Portsmouth, Portsmouth PO1 3FX, UK
13. Instituto de Astrofísica de Canarias, C/Vía Láctea, s/n, E-38200 La Laguna, Tenerife, Spain
14. Departamento Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
15. Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St George Street, Toronto, ON M5S 3H8, Canada
16. Institut d’Astrophysique de Paris, CNRS & Sorbonne Université, UMR 7095, 98 bis boulevard Arago, F-75014 Paris, France
17. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
18. Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA
19. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
20. Departamento de Física Teórica, Módulo 15, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
21. Centro de Investigación Avanzada en Física Fundamental (CIAFF), Universidad Autónoma de Madrid, E-28049 Madrid, Spain