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SFOAE STCs for subject KC15FR at the 947 Hz (A–C) and the 4026 Hz probe frequency (D–F). The data are grouped in columns according to the probe level (10, 20, and 30 dB SL), and the line color indicates the SFOAE residual criterion: −6 (black), 0 (dark gray), and 6 dB SPL (light gray). The red diamonds denote the probe parameters. The triangles indicate the frequency of the SOAEs.
