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Dependence of DPOAE level on f2 frequency and level sampled at a resolution of 5 kHz in an individual bat. 2f1–f2 and f2–f1 DPOAE levels increased during anaesthesia (compare A, D with B, E), largest differences at low f2 frequencies (C, F). At low stimulus levels, high-frequency CDTs decreased in amplitude. Colour-coded bars: DPOAE level (A, B, D, E) or the level difference between the anaesthetised and awake condition (C, F).
