1. Geophysical Laboratory; Carnegie Institution of Washington; Washington District of Columbia 20015 USA
2. Department of Natural History Sciences; Hokkaido University; Sapporo 060-0810 Japan
3. NASA Johnson Space Center; Houston Texas 77058 USA
4. Advanced Light Source; Lawrence Berkeley National Laboratory; Berkeley California 94720 USA
5. Jacobs-Sverdrup; Houston Texas 77058 USA
6. SETI Institute; Mountain View California 94043 USA
7. NASA Ames Research Center; Moffett Field California 94035 USA