1. Department of Geophysics and Center for Space Resources, Colorado School of Mines, Golden, CO 80401, USA.
2. Jet Propulsion Laboratory, Pasadena, CA 91109, USA.
3. Department of Geological Sciences, Brown University, Providence, RI 02912, USA.
4. Lunar and Planetary Institute, Houston, TX 77058, USA.
5. Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
6. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA.
7. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139–4307, USA.
8. Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, USA.
9. Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.
10. Planetary Science Directorate, Southwest Research Institute, Boulder, CO 80302, USA.
11. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA.
12. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA.
13. Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, HI 96822, USA.
14. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Case 7071, Lamarck A, 5, rue Thomas Mann, 75205 Paris Cedex 13, France.