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Fig. 6. (A) Frequency distribution of ostracods as a function of water PO2 in the sediment. Note that the values are not normally distributed and the podocopids were most frequently present in the range 3–5 kPa. (B) Frequency distribution of arterial PO2 in the Chinese crab Eriocheir sinensis in normoxia (PO2=21 kPa) from Forgue et al. (1992). (C) Frequency distribution of tissue PO2 in mammalian brains at 37°C (cerebral cortex of rat from Lübbers; Siesjö, 1978). Note the impressive similarity of oxygen status, despite the large evolutionary gap.