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Mean DPOAE level (Ldp) as a function of frequency ratio. Each panel represents data for a different f2. Here, the parameter is L2, with decreasing line thickness indicating increasing L2 in 10-dB increments of L2. When f2 = 8 kHz, data for L2 = 30 to 80 dB SPL are plotted, for all other f2 frequencies data are plotted for L2 ranging from 20 to 80 dB SPL.
