1. Géodésie et Gravimétrie; Univ Paris Diderot, Sorbonne Paris Cité, Institut de Physique du Globe de Paris, UMR 7154 CNRS; F-75013 Paris France
2. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
3. Geosciences Departement and Laboratoire de Météorologie Dynamique (CNRS and IPSL); Ecole Normale Supérieure; Paris France
4. Department of Atmospheric and Oceanic Sciences, and Institute of Geophysics and Planetary Physics; University of California; Los Angeles USA