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. 2022 Aug 10;608(7922):310–316. doi: 10.1038/s41586-022-04935-3

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© The Author(s) 2022

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. 2 — a, ECC images of the S-MCA and L-MCA. The formation of the particle-free zone can be identified in the L-MCA. b, Fracture surface morphologies of the L-MCA. The enlarged view shows the presence of intergranular fracture at the triple junction of GBs with dimpled topology at one side of the grain facets. c, ECCI analysis showing the microbands and the shearing of the particles in the S-MCA and L-MCA.