Deprtment of Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada
Planetary Science Directorate, Southwest Research Institute, 1050 Walnut St, Suite 300, Boulder, CO 80302, USA
Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, 9500 Gilman Drive, La Jolla, CA 92093, USA; Deprtment of Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada
Department of Geological Sciences, Case Western Reserve University, 10900 Euclid Ave, Cleveland, OH 44106, USA
Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Solar System Exploration Division, NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
Department of Terrestial Magnetism, Carnegie Instiution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015, USA