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. 2019 Dec 16;9:19193. doi: 10.1038/s41598-019-55422-1

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© The Author(s) 2019

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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Sub-fossil diatom assemblage profile from the pot sediments recovered from Laguna Sibinacocha. The age profile on the left-hand side is based on the constant-rate-of-supply (CRS) model using excess ²¹⁰Pb activities for the upper ~5 cm, and the basal ¹⁴C date at 9-cm depth is the oldest probable age range from IntCal13. The genus Encyonema is abbreviated as “Enc”.