1. J. L. Bada and D. P. Glavin, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093–0212, USA.
2. G. D. McDonald, Jet Propulsion Laboratory MS 183-301, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.
3. L. Becker, Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI 96822, USA.