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. 2018 Mar 12;25(15):14595–14605. doi: 10.1007/s11356-018-1614-1

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© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — Relationship between mean and median values of tin from 376 measured boat hulls (6–8 measurements per boat hull) in Denmark, Finland, and Germany. (One very high value with mean and median around 2000 was excluded in the graph)