Table 2.

Mean increase in end-tidal ${\mathrm{CO}}_2$ for each subject from their individual baseline, as manually identified on the ${\mathrm{etCO}}_2$ time traces.

	Target: 4 mm Hg	Target: 8 mm Hg
Subject 1	5.1 mm Hg	8.6 mm Hg
Subject 2	5.1 mm Hg	8.6 mm Hg
Subject 3	4.2 mm Hg	8.1 mm Hg
Subject 4	5.9 mm Hg	10.2 mm Hg