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Comparison of the original Kele et al. (2015) calibration (gray dashed line) with the Kelson et al. (2017) calibration (black line) and the recalculated Kele et al. (2015) using the Brand parameters and projection of the data to the reference frame using the University of Washington values (Schauer et al., 2016) for the ETH standards (green line). CDES = carbon dioxide equilibrium scale.
