4 Years
Frequency(Hz) 125 250 500 1000 2000 3150 4000 6300 8000 NRR Mean attenuation(dB) 12.3 24.7 37.3 35.7 35.2 40.5 34.8 27 13.9 24 Standard 1.1 0.3 1.0. 1.7 3.1 2.4 4.4 2.8 1.3 24
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