1. Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA.
2. Georgia Institute of Technology, Atlanta, GA 30332, USA.
3. Arizona State University, Tempe, AZ 85287, USA.
4. Planetary Science Institute, Tucson, AZ 85719, USA.
5. NASA Jet Propulsion Laboratory, La Cañada Flintridge, CA 91011, USA.
6. Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
7. German Aerospace Center (DLR), Berlin 12489, Germany.
8. Lunar and Planetary Institute, Houston, TX 77058, USA.
9. Westfälische Wilhelms-Universität Münster, Münster 48149, Germany.
10. Southwest Research Institute, Boulder, CO 80302, USA.
11. University of California, Los Angeles, CA 90095, USA.
12. United States Geological Survey, Flagstaff, AZ 86001, USA.
13. Lunar and Planetary Laboratory, Tucson, AZ 85721, USA.
14. University of Hawaii at Manoa, Honolulu, HI 96822, USA.
15. Max Planck Institute for Solar System Research, Göttingen 37077, Germany.
16. Istituto di Astrofisica e Planetologia Spaziale INAF, Rome 00133, Italy.