Table 1.
Dependence of mean open time on PCO2. Fitting parameters from analysis in Fig. 2. At all levels of PCO2 channel open time distributions were best fitted by a sum of two exponential distributions: 
. The amplitude of the distribution with the longer mean open time (A
2) increased with PCO2, suggesting that entry into this state was enhanced by CO2. All numbers are given as mean ± standard deviation (this latter value being associated with the accuracy of the fitting procedure)
| PCO2 (mmHg) | τ 1 (ms) | τ 2 (ms) | A 2 (%) |
|---|---|---|---|
| 20 | 2.4 ± 0.5 | 8.0 ± 4.1 | 30 ± 20 |
| 35 | 2.4 ± 0.5 | 6.8 ± 1.3 | 53 ± 16 |
| 55 | 2.7 ± 0.7 | 6.9 ± 1.2 | 61 ± 20 |
| 70 | 1.8 ± 0.7 | 6.1 ± 0.9 | 77 ± 16 |