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. 2017 Aug 29;7:9732. doi: 10.1038/s41598-017-10495-8

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© The Author(s) 2017

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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The LDA processing of vector responses of NT array-based multisensor chip to test organic vapors, 10 ppm concentration: dependence of the average Mahalanobis distance between the centers of vapor-related LDA clusters as a function of operating temperature. The projections of the generated LDA space into primary two-component plane are centered at the obtained points referring to Mahalanobis distance. The inset is the LDA 3-component diagram built for the chip operated at 350 °C: 1-air,2-acetone,3-ethanol,4- isopropanol. All the spheres are calculated at 0.95 confidence level to frame data training clusters; the points are related to the test responses.