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. 2020 Jul 2;10:10955. doi: 10.1038/s41598-020-67863-0

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Raw and mean (± 1 standard deviation) δ¹³C (‰, VPDB) and δ¹⁸O (‰, VSMOW) values for different mammals from Playa del Barco site. The grey bars represent the vegetation δ¹³C cut-off values between a C₃-dominated diet, a mixed C₃-C₄ diet, and a C₄-dominated diet. The lightest grey denotes a δ¹³C bioapatite-diet enrichment of + 14.1‰ (according to Cerling and Harris⁵⁵ values), whereas the darkest one corresponds to an enrichment of + 15.6‰ for xenarthrans (according to Tejada-Lara et al.⁵⁶ values).