1. Biospherical Instruments Inc. San Diego CA USA
2. Environment and Climate Change Canada Toronto Ontario Canada
3. Forschungszentrum Jülich Jülich Germany
4. Finnish Meteorological Institute Helsinki Finland
5. Norwegian Radiation and Nuclear Safety Østerås Norway
6. Finnish Meteorological Institute Sodankylä Finland
7. NorthWest Research Associates Socorro NM USA
8. New Mexico Institute of Mining and Technology Socorro NM USA
9. NILU‐Norwegian Institute for Air Research Kjeller Norway