Fig. 3
Distribution of specific ventilation estimated from the N2 washout of a single compartment physical model. Results from each of five (A to E) repetitions are represented in gray with different symbols. The reference distribution is shown in black. The vertical dashed line (panels c and d) represents the theoretical distribution predicted for the compartment estimated by the classical model (ideal step washout). EELV is the end-expiratory lung volume; vent is the sum of the fractional compartmental ventilations (∑γ); and vd is the dead space volume estimated by: Fowler’s technique (for the generalized model, panels a and b) or the complement of total ventilation (for the classical model, panels c and d)