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Fig. 1. The power spectra level of the 170 dB re 1 µPa white noise used for noise exposure experiments (from Smith et al., 2004). The top curve shows the spectrum as recorded directly from the MiniDisc player. The bottom curve shows the spectrum as recorded by a hydrophone placed centrally within the noise exposure bucket. The spectrum measured within the noise exposure aquarium is similar to that of the bucket, so it is omitted for clarity.





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