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Figure 10: Mean and standard deviation of the attenuation of the ER-15 earplugs obtained in a sound field (REAT, N = 15 subjects) and via headphones (Békésy audiometry, N = 10 subjects), as well as the manufacturer's specification obtained with an artificial head. The error bars and the area between the two gray lines denote the inter-subject standard deviations of the attenuation measured in the sound field and with headphones, respectively

Figure 10: Mean and standard deviation of the attenuation of the ER-15 earplugs obtained in a sound field (REAT, N = 15 subjects) and via headphones (Békésy audiometry, N = 10 subjects), as well as the manufacturer's specification obtained with an artificial head. The error bars and the area between the two gray lines denote the inter-subject standard deviations of the attenuation measured in the sound field and with headphones, respectively