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. 2021 Feb 16;4:220. doi: 10.1038/s42003-021-01710-4

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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 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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Fig. 1 — a, b Location of Lake Øvre Æråsvatnet (circled in red, panel b) in the ice-free refugium of Andøya in northwest Norway. The regional ice extent for Scandinavia in panel a has been plotted for 22 (outer) and 17 (inner) cal kyr BP and is based on Hughes et al.⁷³. The local ice extent in panel b is plotted for 22–18 and 18–17.5 cal kyr BP and is based on Vorren et al.³¹. Panel a is made with map data from Natural Earth, while panel b is made with data from Kartverket.no. c Taxonomic composition of the LGM Andøya sediment samples, based on alignment to a reference panel of 42 eukaryotic or bacterial nuclear genomes of genera that are either expected in the region or which are exotic controls. The scale is the number of sequences mapped to each Megabase (Mb) of the reference genome. For readability, the algal, bacterial, and human results are plotted separately with differing x-axis scales.