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Gerbil DPOAE includes multiple types. (A) Amplitude and (B) phase of DPOAE obtained from one animal (wg97, L1=L2=70 dB SPL, f2∕f1=1.05 and 1.25, frequency step=400 Hz). Phases were normalized to ear canal f1 and f2 phases. Dashed and solid lines represent responses with f2∕f1 of 1.05 and 1.25, respectively. The fine structure in the amplitude and different phase slopes indicate that the DPOAE is a combination of multiple types.
