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Fig. 4. The effect of mean cardiac output during dives (d, expressed as a percentage of nominal resting ) on (A) surface intervals (ts) and (B) dive durations (td). Circles, effect of varying d by changes in arterio-venous shunt flow (a-); black diamonds, effect of varying d by changes in cardiorespiratory coupling (via , see text for details); white diamonds, effect of hypoxia (FIO 2=0.15) on the responses to varying ; triangles, effect of elimination of splenic contraction on the responses to varying .