Left panel: relation between the mass derived from the hydrostatic X-ray analysis (Sect. 3.2.2) compared to the mass derived from the M₅₀₀ − Y_X,500 proxy relation of Arnaud et al. (2010). The shaded region shows the best-fitting BCES orthogonal fit to the data and associated ± 1σ uncertainties, and the dashed line denotes equality. Right panel: relation between the mass derived from the hydrostatic X-ray analysis and the weak lensing mass of Okabe & Umetsu (2008) and Okabe et al. (2010). The shaded region is the best-fitting regression between the two quantities with the slope fixed at 1. The dashed line denotes equality.