1. UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.
2. Department of Geosciences, Idaho State University, Pocatello, Idaho, USA.
3. NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
4. School of Geography and Earth Sciences, McMaster University, Hamilton, Canada.
5. Georgia Institute of Technology College of Engineering, Atlanta, Georgia, USA.
6. NASA Johnson Space Center, Houston, Texas, USA.
7. NASA Ames Research Center, Moffett Field, California, USA.