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. 2021 Jul 8;414(3):1217–1225. doi: 10.1007/s00216-021-03463-9

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© The Author(s) 2021

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 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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Fig. 4 — Box-whisker plot for the weighted average lengths of the perfluorinated carbon chain C_avg of diPAPs, FTMAPs, PFCAs, and FTSAs in 14 soil and 14 paper samples. For diPAPs and FTMAPs which bear two fluorotelomer carbon chains, only the average carbon length of one side chain was considered. The box represents 25 and 75 percentiles and the median, whiskers show the minimum and maximum values, and the diamond indicates an outlier