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. 2024 Nov 13;635(8038):321–326. doi: 10.1038/s41586-024-08130-4

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© The Author(s) 2024

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

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Extended Data Fig. 2 — a, The raw data with all statistical uncertainty before estimating variance in ²⁰⁵Pb⁸¹⁺ contamination from projectile fragmentation. The reduced χ² = 21.6 demonstrates that we are sensitive to variation in contamination that is unquantified elsewhere in the analysis. b, A breakdown of the contributions of each correction to the total uncertainty. Statistical errors are in various blue shades and systematic errors are in various sunset shades.