L_X − T relation as a function of T₅₀₀ (left) and T_300kpc (right) for X-GAP (coloured symbols, see Table D.1) in comparison with literature measurements. In the left-hand panel, the magenta and green curves show the bias-corrected relations from Lovisari et al. (2015) and Zou et al. (2016), respectively. The orange curve in the right-hand panel is the L_X, 500 − T_300kpc relation from XMM-XXL (Giles et al. 2016). In both panels, the blue curve shows the fit to the X-GAP L_X − T relation, with the uncertainty in the mean indicated as the dark blue shaded area and the scatter around the mean indicated in light blue.