Example of the fit of the underlying stellar populations performed by Starlight for four AMIGA galaxies with different colours. The original spectrum is shown as a black line, the fitted spectrum as a grey line and the line at the bottom indicates the unmasked region at which the fit was performed. The average ages (log) and metallicities of the estimated stellar populations for the depicted galaxies are CIG 657 – 8.8 [a] – 0.005 Z; CIG 344 – 9.4 [a] – 0.015 Z; CIG 1029 – 9.9 [a] – 0.023 Z; CIG 735 – 10.1 [a] – 0.020 Z.