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DPOAE thresholds for both the linear-pressure (upper panel) and two-slope (lower panel) methods. For the linear-pressure method, threshold was defined as the intercept of the fitted line with the L2 axis at zero pressure. For the two-slope method, threshold was defined as the L2 value on the fitted function corresponding to Ld=−25 dB SPL. Examples of the relation of the DPOAE threshold to the fitted I∕O function are illustrated by the triangles in Figs. 23.
