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Figure 6: Use of ER-15 earplugs by the 15 musicians as a function of the range of their measured REAT values (x-axis: range in REAT values of 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 6: Use of ER-15 earplugs by the 15 musicians as a function of the range of their measured REAT values (x-axis: range in REAT values of 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)