1. NOAA Aeronomy Laboratory Boulder Colorado USA
2. Also at Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA.
3. Jet Propulsion Laboratory California Institute of Technology Pasadena California USA
4. NOAA Climate Monitoring and Diagnostics Laboratory Boulder Colorado USA
5. NCAR Atmospheric Chemistry Division Boulder Colorado USA
6. NASA Ames Research Center Moffett Field California USA