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Fig. 4. (A) Influence of Krogh’s diffusion coefficient on the calculated mean (squares) and minimum (circles) fibre PO2. Arrowheads point to the values derived for nototheniid (left) and channichthyid (right) muscle protein concentrations. (B) Influence of capillary radius on intracellular oxygen tension. Right arrowhead, icefish vessels; left arrowhead, nototheniid vessels. (C) Influence of fibre radius on oxygenation. Right arrowhead, icefish fibres; left arrowhead, nototheniid fibres.