Representative Pressure-Volume Curve Fit to the Venegas Equation. Representative P-V curve generated at zero end expiratory pressure in a single animal in the Experimental group. Dots are individual data points. The line represents the Venegas equation derived P-V curve. The Venegas parameters a, c and b are labelled, as well as the volume at the point of maximal compliance change (P = c - 1.317d) and the volume equivalent to 7 mL/kg in this animal. See text for further explanation.