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Figure 5: Use of ER-15 earplugs by the 15 musicians as a function of REAT fluctuation of 10 dB or more at adjacent frequencies in individual subjects (y-axis: 1 = always or nearly always, i.e., over 95% of playing time, 2 = often i.e., over 80% of playing time, 3 = occasionally, 4 = never)

Figure 5: Use of ER-15 earplugs by the 15 musicians as a function of REAT fluctuation of 10 dB or more at adjacent frequencies in individual subjects (y-axis: 1 = always or nearly always, i.e., over 95% of playing time, 2 = often i.e., over 80% of playing time, 3 = occasionally, 4 = never)