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. 2022 Jan 13;15(2):571. doi: 10.3390/ma15020571

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Focus radius $σ_{x m i n}$ evolves with various positions of the RF cavity.