Stacked [O III] spectra and FWHM_avg distributions for groups based on (a) radio morphology, (b) central 1.4 GHz luminosity, (c) BPT diagram and (d) optical luminosity. The top panel in each sub figure shows the distribution of the [O III] detections in the groups. Bottom panel in the sub figures shows the stacked [O III] spectra (including non-detections). The fluxes have been normalised to the maximum value for easier comparison of the profile shapes. We only see a significant difference in the stacked spectra based on BPT classification (c).