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. 2020 Dec 3;10:21040. doi: 10.1038/s41598-020-77709-4

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Visualizing (a) the Functional Principal Component (FPC)-space representation of case trajectories, where coordinates represent the amount of deviation from the mean curve in the direction of (b) the first (red) and second (blue) eigenfunctions. The two-dimensional representation in FPC space captures 97% of the variation in the sample of case load trajectories across countries. Points are colored according to their Tukey depth, where higher depths indicate trajectories closer to the mean curve.