Velocity dispersion versus X-ray luminosity. Left panel: velocity dispersion versus X-ray luminosity for the full AXES-2MRS systems with at least five members and our XMM-Newton subsample. The G and NG groups are marked with blue circles and red crosses, respectively. The XMM-Newton subsample is marked with filled green squares. Shaded regions are 1σ uncertainties. Right panel: slope comparison for the σ_v–L_X relation with the literature. The grey-shaded region is the self-similar expectation calibrated according to the X-ray emissivity in the band-limited range of 0.1-2.4 keV for groups with temperatures in the 0.7-3.0 keV interval, while the blue-shaded region is for the bolometric luminosity. (* refers to relations originally expressed as L_X–σ_v and was inverted for comparability).