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. 2021 May 28;12:3212. doi: 10.1038/s41467-021-23568-0

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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. 4 — Segments representing the full width at half maximum (FWHM) of the normalized ESI-MS spectral intensity profiles in Fig. 2c. (m, n) denotes species with the molecular formula Au_mSR_n. Species were classified by N* and marked with different colors. Black: N* = 7 and 8; red: N* = 6; cyan: N* = 4; orange: N* = 2; gray: N* = 0. Species with the same N* were arranged according to their relative size. The entire reaction process can be well divided into Stage I (decomposition process) and Stage II (recombination process).