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Figure 4. Mean DPOAE amplitudes (dB SPL) measured before BSO infusion (filled circles), and after 2 days (open circles), 7 days (filled triangles) and 13 days (open triangles) of BSO infusion in the drug control group. Each panel shows I/O functions for different primary frequencies (f1=1, 2, 4, and 8 kHz).

Figure 4. Mean DPOAE amplitudes (dB SPL) measured before BSO infusion (filled circles), and after
2 days (open circles), 7 days (filled triangles) and 13 days (open triangles) of BSO infusion in the drug
control group. Each panel shows I/O functions for different primary frequencies (f1=1, 2, 4, and 8 kHz).