1. Atmospheric Chemistry Division, National Center for Atmospheric Research, P.O. Box 3000, Boulder, Colorado 80307-3000
2. Ford Research Laboratory, SRL-3083, Ford Motor Company, P.O. Box 2053, Dearborn, Michigan 48121
3. Environmental Science and Technology Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
4. Ford Forschungszentrum Aachen, Ford Motor Company, Dennewartstrasse 25, D-52068 Aachen, Germany