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Fig. 12. Index of gas exchange per breath (CO2 in µmol g–1 min–1 divided by abdominal pumps min–1) as a function of oxygen partial pressure (PO2) for first-instar (circle), third-instar (square), fifth-instar (triangle) and adult animals (diamond). Values are means ± S.E.M.; N=8 for each treatment group.