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. 2019 Jan 28;9:795. doi: 10.1038/s41598-018-37534-2

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© The Author(s) 2019

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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System state dynamics for the primary school data. (a) Unnormalised spectral distance. (b) Normalised distance. The top panels show similarity matrices. The middle panels show the number of events per individual in each time window. The bottom panels show the system state dynamics. The index is the discrete time, each one corresponding to a time window. The length of a time window is τ = 20 min.