# Also in the Article

2.2. PETCO2 Processing Methods

Procedure

Raw data for $PETCO2$ consist of an exported $CO2$ partial pressure timecourse from LabChart at a sampling rate of 1 kHz. To obtain the increase in $PETCO2$ throughout the 5-min breathing protocol and filter out respiratory oscillations, we obtained the upper envelope of each measurement and subtracted the average value of this envelope during the baseline from the entire timecourse.

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