1. Equipe Planétologie et Sciences Spatiales; Université Paris Diderot, Sorbonne Paris Cité Institut de Physique du Globe de Paris, UMR 7154, CNRS; Paris France
2. Department of Earth, Ocean and Atmospheric Sciences; University of British Columbia; Vancouver British Columbia Canada
3. Planetary Science Institute; Tucson Arizona USA
4. Department of Geophysics; Stanford University; Stanford California USA