1. Atmospheric Chemistry and Dynamics Laboratory; NASA Goddard Space Flight Center; Greenbelt Maryland USA
2. Universities Space Research Association; GESTAR; Columbia Maryland USA
3. Earth System Research Laboratory, Chemical Sciences Division; National Oceanic and Atmospheric Administration; Boulder Colorado USA
4. Empa, Swiss Federal Laboratories for Materials Science and Technology; Dübendorf Switzerland
5. Earth System Research Laboratory, Global Monitoring Division; National Oceanic and Atmospheric Administration; Boulder Colorado USA
6. Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
7. Technical University; Eindhoven Netherlands