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Figure 14. Noise level (1/3 oct. bands) in a turboprop plane (solid thick line); noise level at the pilot's ear: (i) with a single passive hearing protection, (ii) with a single active hearing protection (dashed lines), masking curves (solid thin lines)

Figure 14. Noise level (1/3 oct. bands) in a turboprop plane (solid thick line); noise level at the pilot's ear: (i) with a single passive hearing protection, (ii) with a single active hearing protection (dashed lines), masking curves (solid thin lines)