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Record of the difference in δDwax (ΔδDwax) between Lake Chichancanab and Lake Salpeten, indicating changes in the precipitation gradient between the northern and southern Maya Lowlands. ΔδDwax is calculated as the difference between smoothing spline curves fit to isotopic data from each lake core (Fig. 3). The gray envelope indicates the propagated 1σ error for ΔδDwax (±10‰). Modern ΔδDwax (Fig. 2) is indicated by the dashed line.
