We thank Dr. Jürgen Holfort from the Institut für Meereskunde, Kiel, Germany, for making the data of his inversion available to us. We thank two reviewers for their constructive comments. WW, PJL, and WR were supported by NOP II Grant 013001237.10. The contribution of HD was sponsored by NWO PIONIER Grant 030-76-187. All computations were performed on the CRAY Y-MP C98 at the Academic Computer Centre (SARA) Amsterdam, the Netherlands, within the projects SC-479 and SC-212. Use of these computing facilities was sponsored by the Stichting Nationale Computerfaciliteiten (National Computing Facilities Foundation), with financial support from the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Netherlands Organization for Scientific Research).
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