1. NASA Johnson Space Center, Mailcode XI2, 2101 NASA Parkway, Houston, Texas 77058, U.S.A.
2. Institute of Meteoritics, MSC03 2050, University of New Mexico, 200 Yale Boulevard SE, Albuquerque, New Mexico 87131, U.S.A.
3. Department of Geosciences, Stony Brook University, Stony Brook, New York 11794-2100, U.S.A.
4. Department of Geoscience, University of Nevada, Las Vegas, 4505 S Maryland Parkway, Las Vegas, Nevada, 89154, U.S.A.
5. Department of Natural History, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada
6. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, U.S.A.
7. † Present address: Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
8. Department of Earth and Planetary Sciences, University of New Mexico, 200 Yale Boulevard SE, Albuquerque, New Mexico 87131, U.S.A.
9. Jacobs Technology, NASA Johnson Space Center, Mailcode XI, 2101 NASA Parkway, Houston, Texas 77058, U.S.A.