1. Princeton University, Department of Mechanical and Aerospace Engineering, Engineering Quadrangle, Olden Street, Princeton, New Jersey 08544, United States
2. Centre National de la Recherche Scientifique, Institut de Planétologie et d’Astrophysique de Grenoble, BP 53, F-38041, Grenoble, Cédex 9, France
3. Princeton University, Department of Operations Research and Financial Engineering, Sherrerd Hall, Charlton Street, Princeton, New Jersey 08544, United States