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Figure 8: Mean attenuation of the ER-9 and ER-15 earplugs (measured with 10 subjects using Sennheiser HD-650 headphones in Békésy audiometry) compared with the manufacturer's specifications

Figure 8: Mean attenuation of the ER-9 and ER-15 earplugs (measured with 10 subjects using Sennheiser HD-650 headphones in Békésy audiometry) compared with the manufacturer's specifications