1. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
2. Institut für Planetologie, Westfälische Wilhelms–Universität, 48149 Münster, Germany
3. Southwest Research Institute, Boulder, CO 80302, USA
4. Catholic University of America, NASA Goddard Space Flight Center, Greenbelt, MD 20771,USA
5. NASA Marshall Space Flight Center, Huntsville, AL 35812, USA
6. School of Earth and Environmental Sciences, University of Manchester, Manchester, M13 9PL, UK
7. Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada
8. School of Earth and Planetary Sciences, Curtin University, Perth, Western Australia 6102, Australia
9. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia
10. Department of Physics, Albion College, Albion, MI 49224 USA