1. The Energy and Resources Group University of California 345 Giannini Hall Berkeley CA 94720 USA
2. Lawrence Berkeley National Laboratory 1 Cyclotron Rd Berkeley CA 94720 USA
3. Department of Earth and Environmental Systems The University of the South 735 University Ave Sewanee TN 37383 USA
4. Smithsonian Tropical Research Institute Apartado 0843–03092 Balboa Republic of Panama