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. 2019 Jul 16;9:10287. doi: 10.1038/s41598-019-46691-x

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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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(A) Mean squared error (MSE) calculated between the raw thermal spectrum and its Lorentzian fit, as functions of the calculated spring constant (data corresponds to Fig. 5B). The arrows indicate the selected reference values used for rescaling the datasets, as presented in Fig. 8B. The dashed lines represent the mean of each distribution. (B) Relative spring constant values as functions of the laser position. The following values were used as a reference (100%) for calculations: 1.51 N/m for 8 µm, 1.87 N/m for 4 µm and 1.31 N/m for 2 µm aperture, respectively.