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. 2019 Feb 15;11(8):4011–4024. doi: 10.1007/s12520-019-00804-9

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© The Author(s) 2019

OpenAccessThis 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. 5 — C:N atomic ratios and δ¹⁵N stable isotope data obtained from carbonised surface residues (data from Heron et al. 2015; Piličiauskas et al. 2018b; this study) (Table S3)