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. 2015 Apr 10;10(4):e0122392. doi: 10.1371/journal.pone.0122392

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© 2015 Chen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 2 — (A) Reference signal(dashed line) and signal transmitted through bone(solid line) for the 1.5-MHz center-frequency transducer pair on specimen 1. (B) Relationship between attenuation and frequency for the 1.5-MHz center-frequency transducer pair on specimen 1. (C) Relationship between attenuation and frequency for 5 transducer pairs on 7 specimens.