1. Institute for Planetary Research (PF), German Aerospace Centre (DLR), Berlin, Germany.
2. Space Research Institute, Austrian Academy of Sciences, Graz, Austria.
3. Institute for Physics, University of Graz, Graz, Austria.
4. NASA Goddard Space Flight Center (GSFC), Greenbelt, Maryland, USA.
5. American University, NW Washington, District of Columbia, USA.
6. Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.
7. Institute for Geological Sciences, Planetology and Remote Sensing, Freie Universität Berlin (FUB), Berlin, Germany.
8. Centre for Astronomy and Astrophysics, Technische Universität Berlin (TUB), Berlin, Germany.