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Pure-tone air-conduction audiometric thresholds for the listeners with hearing impairment. Listeners are numbered in order of increasing degree of hearing loss. Right ears are represented by circles and left ears are represented by X's. Arrows indicate thresholds exceeding audiometer limits. The normal-hearing limit of 20 dB HL is represented by a horizontal dotted line in each panel. Subject numbers, listener ages in years, and genders are also provided.
