Figure 19a illustrates residual reservoir fluids after six stages of depletion by evaporative fractionation, as modeled using WinProp. Figure 19b shows the gas/condensates removed at each stage. Both series of fluids illustrate the regression of the secondary maximum which accompanies evaporative fractionation, from P10 to P17 in the residual oils, and from P8 to P12 in equivalent-stage gas/condensates.