Computed posterior for the γ_Q coefficient of Eq. (2). From left to right, Q stands for: cluster mass log (M₂₀₀/M_⊙), cluster richness log (N₂₀₀), cluster iron abundance Z/Z_⊙, and cluster central cooling time log (CCT / Gyr). The posterior is the black histogram and the prior the blue histogram, close to the x-axis. The yellow shaded area represents the 68% interval. For each quantity Q, we report the point estimate and the 68% interval.