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. 2020 Mar 25;10:5442. doi: 10.1038/s41598-020-62403-2

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© The Author(s) 2020

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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Spectral characteristics of collagen data in ECM3 and non-ECM3 tumors. (a) Mean absorbance across full spectral range. The average spectrum of the non-ECM3 group has been offset by adding 0.01 to the data for clarity. (b) Mean absorbance across spectral range between 872 cm⁻¹ and 1320 cm⁻¹ that was used for training and 5-fold cross validation. Non-ECM3 spectrum has been offset by adding 0.01 to the data for clarity.