Scaling relation between the virial mass, M_vir, and the mean y-parameter for the tSZ effect (top panel) and for the RMS associated with the kSZ effect (bottom panel). The integration aperture is R_vir. The represented points correspond, for each cluster, to the mean across the three spatial projections. In both panels, the data have been fitted according to y = A(M_vir/M₀)^α, where M₀ = 10¹⁴ M_⊙ is the pivot mass and A is a normalisation. The best fitting parameters are presented in Table 1. The shaded regions correspond to the 16 − 84 confidence interval around the fit, whereas the error bars represent the variation (maximum and minimum values) across the three spatial projections for each cluster.