1. Max Planck Institute for Gravitational Physics, and Institute for Gravitational Physics of the Leibniz Universität Hannover, Callinstrasse 38, 30167 Hannover, Germany
2. Axcon ApS, Diplomvej 381, DK-2800 Kgs. Lyngby, Denmark
3. DTU Space, National Space Institute, The Technical University of Denmark, Elektrovej 327, DK-2800 Kgs. Lyngby, Denmark
4. European Space Research and Technology Centre, European Space Agency, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands