1. DLR, German Aerospace Center, Institute of Planetary Research, Berlin, Germany.
2. Technical University (TU), Berlin, Germany.
3. University of Bordeaux 1, Bordeaux, France.
4. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, USA.
5. NASA Exoplanet Science Institute, California Institute of Technology and Jet Propulsion Laboratory, Pasadena, California, USA.
6. NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
7. Universidad Autonoma de Madrid, Madrid, Spain.
8. Research and Scientific Support Department, ESA, European Space Research and Technology Centre, Noordwijk, the Netherlands.
9. Max-Planck Institut für Astronomie, Heidelberg, Germany.
10. Space Research Institute, Austrian Academy of Sciences, Graz, Austria.
11. Université Paris-Sud, Orsay, France.
12. Department of Radio and Space Science, Chalmers University of Technology, Onsala, Sweden.
13. Lunar and Planetary Laboratory, Tucson, Arizona, USA.
14. Istituto Nazionale di Astrofisica, Rome, Italy.
15. Space Science & Technology Department, CCLRC Rutherford Appleton Laboratory, Oxfordshire, UK.
16. Landessternwarte, Heidelberg, Germany.
17. Leiden Observatory, Leiden, the Netherlands.
18. Observatoire de Paris-Meudon, Laboratoire de l'Univers et ses Théories, Meudon, France.
19. SRON, Netherlands Institute for Space Research, Utrecht, the Netherlands.
20. Department of Physics and Astronomy, University College London, London, UK.
21. The Open University, Milton Keynes, UK.