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. 2023 Apr 4;9:10. doi: 10.1038/s41540-023-00273-w

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© The Author(s) 2023

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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Fig. 3 — a Classification 1 (C1); b Classification 2 (C2). The categories in either classification are displayed in increasing order of variance. Each box represents the distribution of the linear approximabilities of the corresponding category. The p values indicate the statistical significance of the difference in the variance between pairs of categories; only the p values of significantly different pairs are shown. Statistical analysis by F-test of equality of variances.