1. Jet Propulsion Laboratory California Institute of Technology Pasadena California USA
2. Atmospheric and Environmental Research, Inc. Lexington Massachusetts USA
3. School of Earth and Atmospheric Science Georgia Institute of Technology Atlanta Georgia USA
4. School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta Georgia USA
5. Also at School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, Georgia, USA.
6. California Institute of Technology Pasadena California USA