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Linearity of OA-ICOS demonstrated by the excellent linear correlations between the known and measured δ18O (a) and δ2H (b) values. In Figure 1b, the most enriched sample in δ2H (open circle) has not been included in the regression line since the uncertainty in the “known” IRMS value (±4.92 ‰, 1σ) is significantly higher than the uncertainty of OA-ICOS measurements.
