1. Lunar and Planetary Laboratory; University of Arizona; Tucson; Arizona; USA
2. United States Geological Survey; Flagstaff; Arizona; USA
3. Hawaii Institute of Geophysics and Planetology; University of Hawaii at Manoa; Honolulu; Hawaii; USA
4. Department of Geological Sciences; University of Idaho; Moscow; Idaho; USA
5. Center for Earth and Planetary Studies, National Air and Space Museum; Smithsonian Institution; Washington; DC; USA
6. Institut für Planetologie; Westfälische Wilhelms-Universität; Münster; Germany