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Fig. 7. Critical oxygen partial pressure (Pc) values for mass-specific CO2 emission (CO2) determined in multiple ways and for abdominal pumping versus instar. Each symbol indicates the median; error bars mark the 25th and 75th percentiles. (A) Pc for CO2 determined using 95% confidence intervals (N=8 for each treatment group), (B) Pc for abdominal pumping (N=8 for each group), (C–E) Pc determined as the oxygen partial pressure (PO2) when CO2 decreases below 75%, 50% or 25% of normoxic CO2 (N=8 for each group) and (F) Pc determined using paired t-tests to identify the first PO2 at which mean CO2 from Fig. 6 was significantly lower than normoxic CO2.





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