Modeling oxygen binding with the concerted model. The fractional saturation (γ) as a function pO2: L = 9000, c = 0.014, and KR = 2.5 torr. The fraction of molecules in the T state with zero, one, and two oxygen molecules bound (T0, T1, and T2) and the fraction of molecules in the R state with two, three, and four oxygen molecules bound (R2, R3, and R4) are shown. The fractions of molecules in other forms are too low to be shown.