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Fig. 6. A high premortal plateau CO2 predicts a high CO2 at CTmax. A type 1 (predictive least squares) regression fit shows that 46% of the variance of premortal plateau CO2 is explained by CO2 at CTmax (line equation: TV=–10.5+0.998PV, where TV = CO2 at CTmax in µl h-1 and PV = premortal plateau CO2 in µl h-1; P<10-6). The CO2 at CTmax is the CO2 at the CO2 ADS breakpoint; the breakpoint is also the marker for CTmax. Squares, P. californicus; triangles, P. rugosus; the species do not differ significantly, in spite of the large difference in body mass between the two species (see text for statistics).