Isotherms of the apparent molar mass MA⋯B in the parameter space of total loading concentrations, as predicted by Eq. 10. Shown are the ratios MA⋯B/MAB(cAtot,0,cBtot,0) (A) and MA⋯B/Mw(cAtot,0,cBtot,0) (B), for the system of Fig. 2, in a contour plot with the color temperature scale as indicated on the right. The phase transition line of the sedimenting system is indicated by the black dashed line.