San Jose State University, Department of Physics, San Jose, CA 95192, USA; NASA Astrobiology Institute's Virtual Planetary Lab, JPL/Caltech, Pasadena, CA 91125, USA
NASA Ames Research Center, Space Science Division, Moffett Field, CA 94035, USA
Kapteyn Astronomical Institute, University of Groningen, Groningen, 9700 AB Netherlands
University of California, Department of Chemical Engineering, Berkeley, CA 94720, USA