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Accuracy of OA-ICOS for urine analyses demonstrated by the excellent agreement between OA-ICOS and the mean of IRMS measurements for δ18O (a) (three IRMS measurements) and δ2H (b) (two IRMS measurements). Deviation of each individual measurement from the IRMS mean for δ18O (c) and δ2H (d) for measurements by OA-ICOS (blue dots), TC/EA IRMS (red squares), and Cr reduction/CO2 equilibration IRMS (magenta and green triangles).
