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Fig. 4. Body vibrations give rise to waterborne acoustic signals. (A) Simultaneous
recording of a 300 ms body vibration, recorded in Chart software, and a
waterborne sound recorded using Canary software. (B) Expanded view of a
waterborne sound recorded in Canary software. Notice in the spectrogram that
the most intense sounds (darkest colors) are of a low frequency (<300
Hz).