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. 2019 Jun 13;9:8623. doi: 10.1038/s41598-019-44896-8

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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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Position of the discrimination boundary for ventral arm/biceps (blue diamonds) and dorsal arm/triceps (yellow squares) as determined by PLS-DA model for: (a) 450–2500 nm; (b) VNIR/450–1000 nm; (c) SWIR1/1001–1800 nm; (d) SWIR2/1801–2500 nm. Scores lying above the boundary line are classified as “biceps”, Scores lying below the boundary line are classified as “triceps”. All panels display both the calibration and the test set.