Top: Fraction for group galaxies showing their contribution to the total 3 GHz radio-luminosity function at different epochs using the power-law, linear-regression fit method presented in Sect. 3.3.2 versus radio luminosity at 1.4 GHz. Colours represent different redshift bins. Middle: Same as above, but for all massive galaxies (M_* > 10^11.2 M_⊙) with radio emission at 3 GHz (Smolčić et al. 2017b; Laigle et al. 2016). Bottom: Fraction using scaled fit method presented in Sect. 3.3.1. A halo mass cut above 10^13.5 M_⊙ was applied to all plots.