1. Los Alamos National Laboratory; Los Alamos New Mexico USA
2. Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena California USA
3. Institute of Meteoritics; University of New Mexico; Albuquerque New Mexico USA
4. Now at Chevron Energy Technology Company; Houston Texas USA
5. U.S. Geological Survey; Flagstaff Arizona USA
6. Space Science Institute; Boulder Colorado USA
7. Department of Physics; University of Guelph; Guelph Ontario Canada
8. Laboratoire de Planétologie et Géodynamique; Université Nantes; Nantes France
9. Institut de Recherche en Astrophysique et Planétologie; Université Paul Sabatier; Toulouse France
10. Department of Earth Sciences; Brock University; Saint Catharines Ontario Canada
11. Department of Earth Sciences; University of Western Ontario; London Ontario Canada
12. School of Earth and Space Exploration; Arizona State University; Tempe Arizona USA
13. Department of Physics and Engineering; Delaware State University; Dover Delaware USA
14. Muséum National d'Histoire Naturelle; Paris France