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. 2019 Aug 16;11(11):6161–6181. doi: 10.1007/s12520-019-00910-8

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© The Author(s) 2019

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. 3 — Boxplot comparison of the (a) δ¹³C_coll values for humans from QCS and SB and the (b) δ¹⁵N_coll values for humans from QCS and SB. The boxes indicate the inter-quartile range (IQR), Whiskers 1.5× the IQR and the black dots represent the result for each individual