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. 2019 Nov 19;6:272. doi: 10.1038/s41597-019-0267-3

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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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Fig. 2 — Flowchart presenting the quality-rating method implemented by the automated algorithm. Panel (a) shows the first step of the rating procedure using the example of an uranium-thorium series (U-Th) age for teeth, panel (b) shows the second step. Based on the pre-quality rating received in the first step (a), ages are given a final rating depending on whether they are direct or indirect ages and (only for indirect ages) their association with the dated material. Panel (b) has been adapted from Rodríguez-Rey et al.⁴.