1. Space Research Centre, Department of Physics and Astronomy; University of Leicester; Leicester UK
2. Department of Physical Sciences; Open University; Milton Keynes UK
3. Department of Earth and Planetary Science, McGill University; Montreal Quebec Canada
4. Centre de Biophysique Moléculaire; CNRS; Orléans CEDEX2 France
5. Space Remote Sensing; Los Alamos National Laboratory; Los Alamos New Mexico USA
6. Laboratoire Planétologie et Géodynamique de Nantes; LPGN/CNRS UMR6112 and Université de Nantes; Nantes France
7. Exobiology Branch; NASA Ames Research Center; Moffett Field California USA
8. IRAP (CNRS-Univ. P. Sabatier); Toulouse France