1. NASA Headquarters, 300 E Street SW, Washington, District of Columbia 20024-3210 U.S.A.
2. Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, District of Columbia 20560 U.S.A.
3. Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia, Canada
4. Planetary Science Institute, 1700 E Fort Lowell Rd STE 106, Tucson, Arizona 87519, U.S.A.
5. NASA Goddard Space Flight Center, Greenbelt, Maryland, U.S.A.
6. Institut für Planetologie, Westfälische Wilhelm-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
7. NASA Marshall Space Flight Center, Huntsville, Alabama 35812, U.S.A.
8. Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721, U.S.A.