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Figure 7 (a and b) Time variation of turbine noise (raw data) in Pascal and peak of Z-weighted data in dB, indoor and 550 m distant, showing low-frequency noise waveform swings

Figure 7 (a and b) Time variation of turbine noise (raw data) in Pascal and peak of Z-weighted data in dB, indoor and 550 m distant, showing low-frequency noise waveform swings