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Difference in Δ47 calculated as the difference between the value obtained using the Brand parameters and the one using the Huntington parameters, expressed as Δ (Δ47) when fixing δ 13C and changing δ 18O (a) and fixing δ 18O but changing δ 13C (b). The diagrams are calculated for the composition of the ETH working gas using equation (10) in Daëron et al. (2016). Note the opposite effect in carbon versus oxygen isotope ratios. VPDB = Vienna Peedee belemnite.
