1. Department of Atmospheric Science Colorado State University Fort Collins CO USA
2. Now at Handix Scientific Boulder CO USA
3. NorthWest Research Associates Redmond WA USA
4. Department of Statistics Colorado State University Fort Collins CO USA
5. Department of Atmospheric and Oceanic Sciences University of Colorado Boulder Boulder CO USA
6. National Center for Atmospheric Research Boulder CO USA
7. Department of Chemistry Colorado State University Fort Collins CO USA
8. Now at Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder CO USA
9. Now at Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration Boulder CO USA