Optimal Determination of Respiratory Airflow Patterns Using a Nonlinear Multicompartment Model for a Lung Mechanics System

Figure 9

Phase portrait for 𝑥^∗₁(𝑡) versus 𝑥^∗₂(𝑡) and 𝑥₁(𝑡) versus 𝑥₂(𝑡).