1. The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland 20723 USA
2. Department of Earth and Planetary Sciences; Washington University; St. Louis Missouri 63130 USA
3. Center for Remote Sensing; Boston University; Boston Massachusetts 02215 USA
4. Istituto di Astrofisica e Planetologia Spaziali; INAF; 00133 Rome Italy
5. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California 90095 USA
6. Department of Astronomy; University of Maryland; College Park Maryland 20742 USA
7. Planetary Science Institute; Tucson Arizona 85719 USA
8. NASA Lunar Science Institute; Boulder Colorado 80302 USA
9. Astromaterials Research and Exploration Science Division; NASA Johnson Space Center; Houston Texas 77058 USA
10. NASA Goddard Space Flight Center; Greenbelt Maryland 20771 USA
11. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA