Mass subsamples. Left: average pressure profile for M₅₀₀ < 3.6 × 10¹⁴ M_⊙ (cyan circles), and M₅₀₀ ≥ 3.6 × 10¹⁴ M_⊙ (orange stars). The solid blue line is the best-fitting gNFW model for the full sample (Table 1); the ratio plot on the bottom panel is calculated with respect to the best fit for the full sample. Right: marginalised posterior likelihood for the parameters of the best-fitting gNFW model of the low mass (cyan) and high mass (orange) subsamples, compared to the results for the full sample (blue). Contours represent the 68% and 95% confidence regions. Note that some parameters are plotted with logarithmic axes.