Fig. 8.

A. The mean optical pathlength from a representative mouse calculated by fitting the recorded spectra with H₂O absorption spectra over the range 800-850 nm under 4 different F_iO₂ (100%, 30%, 10%, 0%). B. Measurement of mean optical pathlength under varying F_iO₂ levels in a group of control mice. Each black dot represents the average value at the corresponding F_iO₂ level for each mouse (mean ± SD, n = 6). Statistical analysis was performed to compare these values under the different F_iO₂ using one-way ANOVA with repeated measures and a Bonferroni post-hoc test (*- p ≤ 0.05). Significance between repeated F_iO₂ levels is not shown for clarity.