As Figure 1 but for a simulated ‘perfect data’ 2-solute system, with 50% by weight of a monomer (M1= 25,630 Da) and 50% by weight of a dimer (M2 = 51,260 Da). True Mw,app = Mw = 38,450 Da. Retrieved Mw,app (from extrapolation of M* to the cell base, and from the hinge point) = 38,500 Da. Fitted lines are as defined in the legend of Figure 1.