Distribution of the pPXF weights (red colours), indicating the mass fraction of each stellar population of given age and metallicity, derived from fibre noiseless spectra. The mass-weighted age and metallicity measured with pPXF is shown as a red star, while mass-weighted age and metallicity derived from the simulation is marked as a black star. Black lines represent the marginalised distribution of ages and metallicities derived from the simulation, while red curves show those inferred from pPXF. The progenitor galaxies at z = 0.7 are shown in the top row, while their descendants at z = 0.5 and z = 0.3 are shown in the middle and bottom rows, respectively.