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. 2015 Jul 13;10(7):e0132250. doi: 10.1371/journal.pone.0132250

Fig 5. Distortion of the N2 signal due to changes of the O2 flow-offset setting.

Fig 5

(A) Lowering the O2 flow-offset setting from 618 to 578 ms (-7%) resulted in distorted N2 signal in the last washout breaths, typically forming spikes at the end of expired signal trace and optionally divots at the end of inspiration. (B) Elevating the O2 flow-offset setting from 618 to 658 ms (+7%) typically resulted in divots at the beginning of inspiration and optionally spikes at the beginning of expired N2 signal trace.