1. Department of Astronomy; Cornell University; Ithaca New York USA
2. Physics Department; California Polytechnic State University; San Luis Obispo California USA
3. Lunar and Planetary Laboratory; University of Arizona; Tucson Arizona USA
4. Abteilung Geochemie; Max-Planck-Institut für Chemie; Mainz Germany
5. Centre d'Etude Spatiale des Rayonnements/Centre National de la Recherche Scientifique/Université Paul Sabatier Toulouse; Toulouse France
6. Institute of Meteoritics and Department of Earth and Planetary Sciences; University of New Mexico; Albuquerque New Mexico USA