1. University of Washington Astronomy Department, Seattle, Washington, USA.
2. NAI Virtual Planetary Laboratory, Seattle, Washington, USA.
3. University of Washington Astrobiology Program, Seattle, Washington, USA.
4. Department of Earth and Environmental Sciences, University of St Andrews, Fife, Scotland.
5. Blue Marble Space Institute of Science, Seattle, Washington, USA.
6. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.