This work was funded by the Office of Naval Research under Grant N00014-01-1-0984. Author M.-P. Lelong also received support from NSF-PO-9811939. The authors thank Eric Kunze, Kurt Polzin, and Raffaele Ferrari for insightful discussions; Kraig Winters for the use of his numerical model; and Bill Smyth and an anonymous reviewer for helpful comments on the manuscript.
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