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Volume-pressure curve of the lung, chest wall, and total respiratory system (Plung, Pcw, Prs, respectively) to identify the relative lung distention at functional residual capacity (FRC) (Palv = 5 cmH2O, red arrow) and completion of the alveolar unfolding process occurring in the range Palv 15–25 cmH2O (blue arrows), corresponding to ∼65–80% Vital Capacity (VC, shaded area).
