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. 2018 May 30;8:8391. doi: 10.1038/s41598-018-26780-z

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Hierarchical cluster trees and the corresponding functional similarity matrices for the temporal muscle synergies (A) and the spatial muscle synergies (B) across all subjects. Synergy T_a,b represents the bth temporal synergy (S for spatial synergies) of subject a. Color-coded branches of the hierarchical trees represent highly similar synergies that are clustered together. Synergies are clustered based on the correlation of their confusion matrices. Pairwise correlation of the confusion matrices of synergies i and j is shown as entry (i, j) of the functional similarity matrix (see color-coding of similarity matrix regions and synergy labels).