Figure 4:

Average percent precision of multiple combinations of approaches and equations to estimate dilution spaces, elimination rates, and VCO₂ with application of different methods of utilizing ¹⁷O abundances to correct for background fluctuations (intercept method). The black trace shows the average percent precision of each combination of equations without any correction and each color represents a different background correction approach. The inset shows an enlargement of the data for the most precise combinations with and without ¹⁷O background fluctuation correction.