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. 2019 Jul 25;19(15):3277. doi: 10.3390/s19153277

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Comparison between PSO-SVR predicted content and reference content present in the (a) N calibration set; (b) N prediction set; (c) P calibration set; (d) P prediction set; (e) K calibration set; and (f) K prediction set.

Comparison between PSO-SVR predicted content and reference content present in the (a) N calibration set; (b) N prediction set; (c) P calibration set; (d) P prediction set; (e) K calibration set; and (f) K prediction set.