Light-weighted (upper panels) and mass-weighted (lower panels) population properties derived with pPXF without [α/Fe] modelling as a function of those derived with [α/Fe] modelling. This figure includes all spatial bins from all galaxies in the present TIMER sample. Highlighted in orange are the means and standard deviations in 17 bins, each combining the results from approximately 2600 observed spectra. We note that the large standard deviation in the bin with the lowest metallicity is a result of the large range of metallicities included in this bin and does not necessarily result from an increased scatter.