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Fig. 7. (A) Air sac end-of-dive PO2 (final PO2 corrected to 0-m depth) and (B) end-of-dive O2 fraction (% O2) decreased with increasing dive duration. Regression equations: PO2: y=(105.3xe–x/2.50)+7.7, r2=0.39, P<0.0001; O2 fraction: y=(15.3xe–x/2.52)+1.7, r2=0.40, P<0.0001.