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Fig. 3. Selection of PO2 profiles in the trout
retina. Position at 0 µm corresponds to the inner surface of the retina
(ILM). Shaded areas depict range of lowest to highest
PO2. Electrodes were advanced into (closed
symbols) and withdrawn out of (open symbols) the retina, resulting in
duplicate recording lines. The red horizontal line indicates arterial
PO2 (1 mmHg=133.3 Pa).