Fig. 4. Distribution of half-time k^e0for desflurane. The values for each patient are connected. Patients with unreasonably large (> 10 min) values of half-time k^e0, corresponding to step function rather than to sigmoidal relations between effect site concentration and the electroencephalographic component, at any electroencephalographic parameter are not plotted. SEF 95 = spectral edge frequency 95.