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Average DPOAE growth functions (n = 17 anaesthetised and 17 awake animals) of 2f1–f2 and f2–f1 DPOAE at 20, 40 and 60 kHz f2 frequency (Error bars give absolute value of SD, shown for graphical reasons only as upward (anesthetised) or downward bar (awake)). See legend Figure 3 for details.
