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. 2019 Jul 12;20:149. doi: 10.1186/s12931-019-1104-0

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Comparison of FtO2 measured in nose-throat replica MRI5 vs. average data obtained from the larger set of 15 adult nose-throat replicas. Error bars denote one standard deviation. Exercise, Rest, and Sleep breathing patterns are described in Chen et al. [23]. Data labels ‘2.0 L/min’ and ‘6.0 L/min’ refer to tests performed with continuous oxygen delivery at the flow rate indicated