1. ESSC-ESF, Strasbourg, France.
2. IWF/ÖAW, Graz, Austria.
3. LESIA, Meudon, France.
4. New Mexico State University, USA.
5. IAS, Paris, France.
6. CNES, France.
7. École Polytechnique, France.
8. ISSI, Bern, Switzerland.
9. Osservatorio Capodimonte, Italy.
10. IPSL, Paris, France.
11. IFSI-CNR, Rome, Italy.
12. Birkbeck College, UK.
13. University of Leiden, the Netherlands.
14. ASTRON, the Netherlands.
15. DLR, Germany.
16. Open University, UK.
17. University of Wales, UK.
18. MPE Garching, Germany.
19. MPI, Germany.
20. IAA-CSIC, Granada, Spain.
21. formerly University of Madrid, Spain—deceased.
22. University of Copenhagen, Denmark.
23. IAG, Liège, Belgium.
24. Technical University, Darmstadt, Germany.
25. CBM-CNRS, France.