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. 2019 Mar 5;9:3510. doi: 10.1038/s41598-019-40115-6

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© The Author(s) 2019

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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The vial was cooled using different TESU temperatures (a) or gas content in the gap (b). Helium gas was used for the experiments of panel (a), whereas in panel (b), the TESU was set to T_∞ = 80 K. The dashed lines show the solutions to Eq. 1, using ε as a fitting parameter, see the text. The inset of panel (a) shows that the time scale of the cooling do not differ much when varying the TESU temperature.