1. Department of Earth and Planetary Sciences; University of California; Santa Cruz California USA
2. Planetary Science Directorate; Southwest Research Institute; Boulder Colorado USA
3. McDonnell Center for the Space Sciences and Department of Earth and Planetary Sciences; Washington University; St. Louis Missouri USA
4. Department of Space Studies; Southwest Research Institute; Boulder Colorado USA
5. Department of Earth and Space Sciences; University of Washington; Seattle Washington USA
6. California Institute of Technology; Jet Propulsion Laboratory; Pasadena California USA
7. Lunar and Planetary Lab; University of Arizona; Tucson Arizona USA