1. Institute of Geophysics, ETH Zürich, Sonneggstrasse 5, Zürich, Switzerland.
2. Department of Geological Sciences/Cooperative Institute for Research In Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80305–3337, USA.
3. Planetary Geodynamics Laboratory, NASA/Goddard Space Flight Center, Greenbelt, MD, USA.
4. National Oceanic and Atmospheric Administration’s National Centers for Environmental Information/CIRES, University of Colorado, Boulder, CO 80305–3328, USA.
5. DTU Space, Lyngby, Denmark.