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. 2021 Jul 26;11:15147. doi: 10.1038/s41598-021-94610-w

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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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Boxplots summarizing the distribution of the relative position of populations of brevirostrine, intermediate and longirostrine biting odontocetes and pinnipeds along the δ¹⁵N and δ¹³C ranges. Boxes represent first and third quartiles, lines the median and whiskers the 95% confidence interval.