1. Atmospheric Chemistry and Dynamics Laboratory NASA/GSFC Greenbelt MD USA
2. Joint Center for Earth Systems Technology University of Maryland Baltimore County Baltimore MD USA
3. Science Systems and Applications Inc Lanham MD USA
4. Environment and Climate Change Canada Downsview ON Canada
5. Royal Meteorological Institute of Belgium Uccle Belgium
6. Institute for Energy and Climate Research: Troposphere (IEK8) Jülich Research Centre Jülich Germany
7. National Center for Atmospheric Research Earth Observations Laboratory Boulder CO USA
8. Global Monitoring Laboratory NOAA Earth System Research Laboratory Boulder CO USA
9. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder CO USA
10. Federal Office of Meteorology and Climatology MeteoSwiss Payerne Switzerland
11. Kellogg Brown & Root Fulton MD USA