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. Author manuscript; available in PMC: 2015 Sep 15.
Published in final edited form as: Respir Physiol Neurobiol. 2014 Jul 17;201:84–92. doi: 10.1016/j.resp.2014.07.002

Fig. 3.

Fig. 3

Signal quality index for CO2. Panel A shows a flow signal (dark, dotted line) and the corresponding tidal-volume signal (blue, solid line). Note that, the PETCO2 corresponding to breath #4 is about 28 mmHg. Such a sudden drop in PaCO2 is unlikely to be physiological. Breath #4, therefore, is assigned a low signal quality index, as shown in panel C.