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. 2017 Jan 18;4(1):160412. doi: 10.1098/rsos.160412

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© 2017 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — Cross-sectional micrographs show the gradation in the areal density of fibres in (a) inner, (b) middle and (c) outer parts of the cross section.