1. Univ. of California, Berkeley (United States)
2. Space Sciences Lab. (United States)
3. NASA Goddard Space Flight Ctr. (United States)
4. Lawrence Berkeley National Lab. (United States)
5. Univ. of Delaware (United States)
6. Univ. of California, Santa Cruz (United States)
7. Montana State Univ. (United States)
8. Southwest Research Institute (United States)
9. Univ. Presbiteriana Mackenzie (Brazil)