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Figure 3. Interpolation spline used to provide continuous calibration curve from Cariaco Basin core PL07-56PC data set, compared to data from German pines; PB, YD and light blue bar as in Figure 2. Correlation between spline and German pine data is excellent (r = 0.99). Cariaco Basin dates that overlap with tree-rings and bracket the abrupt shift from intense to reduced upwelling at the Younger Dryas termination show no systematic increase in 14C ages during the Younger Dryas. All 14C errors are reported at 1s.