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PEC (left) and PSV (right) at stimulus levels of 100, 110, and 120 dB SPL. (wg149 runs 16–18). Pressure spectra were screened visually for fo/2 subharmonics, and identified subharmonics are plotted with green circles. Where no subharmonic was found, the level of the noise floor at the fo/2 frequency is plotted. Fundamental frequencies (fo) are shown at the top axis of each panel; the subharmonic frequencies (fo/2) are shown at the bottom axis.
