1. SRON Netherlands Institute for Space Research; Utrecht Netherlands
2. National Oceanic and Atmospheric Administration; ESRL/GMD; Boulder Colorado USA
3. Institute for Marine and Atmospheric Research Utrecht; Utrecht University; Utrecht Netherlands
4. MAQ; Wageningen University and Research Centre; Wageningen Netherlands
5. IMK-ASF; Karlsruhe Institute of Technology; Eggenstein-Leopoldshafen Germany
6. UPMC University Paris 06, Université de Versailles Saint-Quentin-en-Yvelines, CNRS/INSU, LATMOS-IPSL; Paris France
7. Meteorological Research Institute; Tsukuba Japan
8. National Institute for Environmental Studies; Tsukuba Japan
9. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA