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Figure 4


Fig. 4. Ambient noise in the tank. (A) Waveform of the measured noise in a 1.5 s segment. (B) Noise spectral density (dB re. 1 µpa2/Hz) from 1 Hz to –500 kHz using a 1024-point FFT. The peak at 125 kHz and harmonics of this are weak system noise artifacts.





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