1. Massachusetts Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts, U.S.A. .
2. Formerly Massachusetts Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts, U.S.A.; presently Shell International E&P, Rijswijk, the Netherlands. .
3. Formerly Massachusetts Institute of Technology, Earth Resources Laboratory, Cambridge, Massachusetts, U.S.A.; presently Lawrence Berkeley National Laboratory, Earth Science Division, Berkeley, California, U.S.A. .