1. Earth System Research Laboratory, Chemical Sciences Division; National Oceanic and Atmospheric Administration; Boulder Colorado USA
2. Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
3. Laboratory of Photochemistry and Chemical Kinetics, Department of Chemistry; University of Crete; Heraklion Crete Greece
4. NASA Goddard Space Flight Center; Greenbelt Maryland USA
5. Science Systems and Applications, Inc.; Lanham Maryland USA