1. Department of Earth and Planetary Sciences University of California Santa Cruz Santa Cruz CA USA
2. Royal Observatory of Belgium Brussels Belgium
3. Institute of Geophysics ETH Zürich Zürich Switzerland
4. Physik‐Institut University of Zurich Zurich Switzerland
5. Institut de Physique du Globe de Paris, CNRS Université Paris Cité Paris France
6. Institute of Planetary Research German Aerospace Center (DLR) Berlin Germany
7. Schmidt Institute of Physics of the Earth Russian Academy of Sciences Moscow Russia