1. Department of Earth, Ocean and Atmospheric Sciences; The University of British Columbia; Vancouver, British Columbia Canada
2. GFZ German Research Center for Geosciences; Potsdam Germany
3. Planetary Science Institute; Tucson AZ USA
4. Laboratoire de Planétologie et Geodynamique; UMR 6112 CNRS & Université de Nantes; Nantes France
5. Space Science Laboratory; University of California; Berkeley CA USA
6. Department of Earth, Atmospheric, and Planetary Sciences; Massachusetts Institute of Technology; Cambridge MA USA