Panel a): marginalized distributions (diagonal) and 2D correlations (off-diagonal) plots of the parameters of the assumed gNFW model. The MCMC procedure constrains the parameters of interest (from the bottom of the diagonal to the top): P₀, r_p, a, and b and marginalize over the map zero level and y-mJy/beam calibration coefficient. Panel b): maximum likelihood NIKA+Planck/AMI pressure profile (black), the 1-sigma dispersion (light blue), and XMM-Newton constrained pressure profile (red).