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. 2018 Mar 16;8:4710. doi: 10.1038/s41598-018-22983-6

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© The Author(s) 2018

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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Thickness dependence of the superconducting transition temperature. Circles: data of the present work, for layers deposited on SiO₂ (red filled) and on sapphire (yellow filled). For comparison, we have added data from: Zhao et al. (squares)²⁰; Gubin et al. (diamonds)²²; Delacour et al. (triangles)²¹.