1. GFZ German Research Centre for Geosciences Potsdam Germany
2. Leibniz Institute of Atmospheric Physics at the University of Rostock Kühlungsborn Germany
3. CNES Space Geodesy Office Toulouse France
4. Institute of Physics and Astronomy University of Potsdam Potsdam Germany
5. Department of Earth and Planetary Sciences UCLA Los Angeles CA USA
6. Met Office Exeter UK