Fig. 7. The relation between the volume of CO₂ withheld immediately following exposure to hyperoxia (CO₂ deficit), and the volume (µl) of CO₂ emitted immediately after restoration of normoxia (CO₂ surplus), N=21, at 15°C. CO₂ deficit explains 58% of CO₂ surplus variance. CO₂ surplus=0.81–1.353±0.264 CO₂ deficit; F_[1,19]=26.2, P<10^–6. The slope of this relation does not differ significantly from 1.0 (P=0.1). See text for details.