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2 concentrations and isotope temperatures as represented by spline approximations. Given errors reflect the uncertainty in the actual positions of the extrema, which are weakly dependent on the degree of smoothing. They do not take into account the uncertainty in Δage. This additional error is treated separately in the discussion of the data.
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2 record of the last four glacial-interglacial cycles during our sample selection process. This study was funded by NSF grants OPP9615292, OPP9196095, and OPP9118534. Financial support of H.F. has been provided by Deutsche Forschungsgemeinschaft.
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