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Supported by NSF (grant OCE0117886). The Guggenheim and Leverhulme Foundations and a Clare Hall Visiting Fellowship provided support for D.W.L. at Cambridge University in 2002-2003. Laboratory assistance from J. Horton and J. Wells and mass spectrometer operation by G. Paradis were critical to the success of this study. We thank J. Severinghaus for the suggestion to compare our data to the GISP2 methane record; M. Kienast, C Rühlemann, R. Schneider, A. Koutavas, N. Shackleton and M. Cane for discussion; and J. Kennett and two anonymous reviewers for suggestions.
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