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. 2015 May 13;15(5):11239–11257. doi: 10.3390/s150511239

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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Bland-Altman charts for the comparison of CO₂ concentrations measured with the NDIR sensors and the OP-laser, averaging out data from different numbers of NDIR sensors. The dashed blue lines represent the 95% confidence interval.