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. 2022 Nov 16;12:19650. doi: 10.1038/s41598-022-21882-1

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© The Author(s) 2022, corrected publication 2022

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Reference preparation with the fixing clips as (A) a scheme and (C) in reality, and without the clips (B) as a scheme and (D) in reality. The grey arrow shows a part of a sample that floated to the surface of the resin (for detail see Fig. 6). The cross-section diameter is 3 cm.