Series of histograms depicting the mass assembly through time (of old stars ever-formed stellar mass vs. lookback time) of bulges (left-hand side) and disks (right-hand side) of the three ⟨δμ_9G⟩ intervals (iA, iB and iC, from top to bottom). The histograms refer to the total stellar mass ever formed, not being corrected from the mass returned into the ISM through SNe and stellar winds. In addition, the histograms result from the combination of the mass assembly histories of all galaxies appertaining to each interval. It is colour coded according to the metallicity of each stellar population, as indicated by the legend.