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. 2016 Jun 15;11(6):e0157351. doi: 10.1371/journal.pone.0157351

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© 2016 Bellan 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 credited.

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Fig 1 — X (horizontal) and Y (vertical) (a) vs. transverse axes (b). This figure refers to previous research (i.e. [4,7]).