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. 2014 Nov 13;4:7038. doi: 10.1038/srep07038

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(a) The time-dependent incident pressure signal containing simultaneously three specific frequencies 4.2 kHz, 5.8 kHz, and 9.2 kHz. The inset shows the zoomed-in incident signal. (b–h) The detected pressure signal at the bottom of seven representative channels for the space-coiling structure. The obvious enhancement of the pressure signal amplitude is noticed in channel 1, 15 and 30.