Comparison of the global properties of XLSSC 122 (blue point) with lower-z, X-ray selected cluster samples. Factors of E(z) = H(z)∕H₀ encode self-similar evolution of the scaling relations. Left column: gray points show measurements from Mantz et al. (2016b, z < 0.5), and solid/dashed lines the corresponding scaling relations (accounting for X-ray flux-selection bias) and their uncertainty (including intrinsic scatter). These measurements were obtained from Chandra data, but otherwise the procedure for determining each observable (and r₅₀₀) is essentially the identical to the one used in this work. Luminosities correspond to the rest-frame 0.1–2.4 keV band. Temperatures from Mantz et al. (2016b) are centre-excised (excluding radii < 0.15 r₅₀₀), while the measurement for XLSSC 122 is not. Right column: gray points show measurements of the 100 brightest XXL clusters (z < 1.05; XXL Papers II, III and XIII). Luminosities correspond to the rest-frame 0.5–2.0 keV band, and luminosities and temperatures are measured in an aperture of radius 300 kpc. Gas masses are measured within r₅₀₀, as estimated from the mass-temperature relation of XXL Paper IV. In the centre-right panel, solid line shows the M_gas –T relation of XXL Paper XIII.