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Fig. 4. Entering the premortal plateau section of the ramp response (see text and CO2 trace in Fig. 2) at a higher temperature predicts a higher exit temperature. A type 1 (predictive least squares) regression fit shows that 64% of the variance of exit temperature is explained by entry temperature (line equation: XT=12.1+0.779NT, where XT = exit temperature in °C and NT = entry temperature in °C; P<10-6). Squares, P. californicus; triangles, P. rugosus; the species do not differ significantly (see text).