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. 2020 Oct 12;7:335. doi: 10.1038/s41597-020-00663-3

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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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Fig. 4 — Validation of our modelled Signal-to-Noise ratio (SNR) against SNR calculated for the Vostok (a–d) and NGRIP (e–h) ice-cores^56–58. Differences between the shape of the distributions and the SNR values were significant in b, with significant differences in mean SNR for b and c, but non-significant in all other windows based on PERMDISP and PERMANOVA results.