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Figure 11. Noise level (1/3 oct. bands) in a turboprop plane (solid thick line); noise level under the pilot's headset (dashed line), masking curve under the headset (solid thin line)

Figure 11. Noise level (1/3 oct. bands) in a turboprop plane (solid thick line); noise level under the pilot's headset (dashed line), masking curve under the headset (solid thin line)