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. 2019 Dec 23;16:159. doi: 10.1186/s12984-019-0632-7

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — mean and standard deviation of the relative phase (expressed in degrees) in the eleven phases (A to K, as defined in Fig. 1) of the three experimental conditions (condition 1 in white, condition 2 in gray and condition 3 in black). Letters on top of the standard deviation indicate statistical differences from the referenced phase (p < 0.05)