1. The first four authors shared the primary responsibility for writing this document.
2. Reed College, 3203 SE Woodstock Blvd., Portland, OR 97202, USA,
3. German National Research Center for Information Technology, Schloss, Birlinghoven, D-53754 Germany,
4. Prediction Company, 236 Montezuma St., Santa Fe, NM 87501, USA,
5. Los Alamos National Laboratory, MS-D450, Los Alamos, NM 87545, USA,
6. California Institute of Technology, Pasadena, CA 91125,
7. School of Environmental and Information Science, Charles Stuart University, Albury NSW 2640 Australia,
8. Institute of Physics, The Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153 Japan,
9. Department of Pure and Applied Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo 153 Japan,
10. Department of Zoology, University of Oklahoma, Norman, OK 73019, USA,