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Fig. 4
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(a) Signal in time domain of two audios. (b) Spectrum of a segment of these two audio of the same duration (Δt). The blue line is for the nut A and a balloon of mean radius (9.7 ± 0.2) cm, with peak intensity of (345 ± 11) Hz, and red line is for the nut S and a balloon of mean radius (9.1 ± 0.2) cm.
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