1. Department of Earth and Space Sciences and Astrobiology Program, University of Washington, Seattle, Washington, USA.
2. Department of Earth Sciences, University of California, Riverside, California, USA.
3. Department of Earth and Environmental Sciences, University of St Andrews, St Andrews, Scotland, UK.
4. NASA Astrobiology Institute's Virtual Planetary Laboratory, Seattle, Washington, USA.
5. Department of Astronomy and Astrobiology Program, University of Washington, Seattle, Washington, USA.
6. School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada.