I am grateful to Eric Lindahl, our laboratory engineer, whose knowledge of optics made this work possible; Alex Mendez, who as an undergraduate has contributed much to the work; and Iakov Afanasyev of Memorial University, St. Johns, Newfoundland, who as a sabbatical visitor in Seattle has made striking progress in refining optical altimetery, which will be reported in due course. Partial funding for the laboratory comes from the G. Unger Vetlesen Foundation of New York. Thanks to the referees for their comments.
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