1. Department of Physical GeographyUniversiteit Utrecht Utrecht The Netherlands
2. Department of GeographyDurham University Durham UK
3. Swiss Federal Institute for Forest, Snow and Landscape Research WSL Birmensdorf Switzerland
4. Laboratoire de Planétologie et Géodynamique, CNRS UMR 6112, Université de Nantes Nantes France
5. Department of Earth SciencesDurham University Durham UK
6. Planetary Science Institute Tucson AZ USA
7. International Research School of Planetary SciencesUniversità Gabriele D'Annunzio Pescara Italy
8. Department of Earth SciencesNatural History Museum London UK