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. 2020 May 19;10:8293. doi: 10.1038/s41598-020-65160-4

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© The Author(s) 2020

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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Pearson’s correlation between active compounds and their antioxidant capacity in different plant organ extracts: (a) correlation in roots, (b) correlation in stems, (c) correlation in leaves, and (d) correlation in seeds. TPC: Total Phenolic Contents, TFC: Total Flavonoids Contents, DPPH_TEAC: antioxidant capacity. The intensity of the colour and the size of the circle are proportional to the correlation coefficients. To the right of the correlogram, the colour legend shows the correlation coefficients and the corresponding colours. The correlation was visualised by the ggcorrplot package.