1. Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771
2. Laboratory for Planetary Atmospheres, NASA Goddard Space Flight Center
3. Department of Meteorology, University of California, Los Angeles 90024
4. Center for Space Research and Department of Physics, Massachusetts Institute of Technology, Cambridge 02139
5. University of California Los Alamos Scientific Laboratory, Los Alamos, New Mexico
6. Jet Propulsion Laboratory, Pasadena, California 91109