Fig. 2From: Two-point normalization for reducing inter-laboratory discrepancies in δ17O, δ18O, and Δ′17O of reference silicatesOxygen isotope compositions of a VSMOW and b SLAP. 3σ outliers are not included in the calculations of average and standard deviation. Solid gray lines indicate average values. Dashed gray lines display 1σ, 2σ, and 3σ standard deviations, respectivelyBack to article page