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. 2015 Jun 23;15(6):14788–14808. doi: 10.3390/s150614788

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Ultrasound pressure distributions of the remaining waves for (a) the two-layer sensor after attenuation, and (b) the one-layer sensor after attenuation.