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. 2023 Jul 31;8(8):1480–1494. doi: 10.1038/s41564-023-01432-9

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© The Author(s) 2023, corrected publication 2023

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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Extended Data Fig. 3 — Two nearby locations a) and b) had two peaks with retention times 217 s and 275 s for C₄H₆O₂ corresponding to two different compounds. The retention time of 217 s matched the expected retention time for diacetyl, but the retention time of 275 s did not match with any known compounds. Therefore, C₄H₆O₂ may represent diacetyl and/or one additional unidentifiable compound, and is referred to as diacetyl⁺ in the manuscript. The diacetyl peak (retention time of 217 s) is indicated with an arrow.