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Figure 5: Standard deviations of repeated thresholds measured with a headphone Sennheiser HDA 200: (a) at conventional audiometry, (b) as "means" of subjects' intraindividual standard deviations over the six measurements in this study (in fact the square roots of the means of the variances), for the control group (N=23, dashed lines) and the NAC group (N=11, solid lines). Circles = right ear, crosses = left ear N=23, dashed lines) and the NAC group (N=11, solid lines). Circles = right ear, crosses = left ear"> 
