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. 2018 Aug 13;8:12025. doi: 10.1038/s41598-018-30642-z

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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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Plot showing the correlation between (a) the width at 80% of the height of the 565 cm⁻¹ peak (FW80%) and the width at 85% of the height of the 604 cm⁻¹ peak (FW85%); (b) the FWHM of the 1035 cm⁻¹ peak and the width at 85% of the height of the 604 cm⁻¹ peak (FW85%); (c) the variation of the 1020, 1090 and 1110 cm⁻¹ bands normalised to the 1035 cm⁻¹ band among all bioapatite samples. The relative standard deviation for these parameters is within 5%.