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Colored lines are mean CR measurements (baseline to peak voltage) from different sound levels and frequencies: 353 Hz (blue, n = 15), 500 Hz (red, n = 30), and 707 Hz (green, n = 14). Gray lines are measurements from individual animals in response to 500 Hz. The variation of measurements from 353 and 707 Hz, while not shown, was similar to that at 500 Hz.
