AMI posterior distributions for RXC J2228.6+2036, allowing α and β to vary. Posterior means are indicated with green lines and crosses, and the Planck values for α and β from Planck Collaboration Int. V (2013) are shown with red lines and crosses. The priors on the parameters in the AMI analysis are shown as black dashed lines. θ_s is in arcmin and Y_tot is in arcmin². Also shown in the upper right hand corner are the posteriors produced by AMI (black) and Planck (red) using the universal profile, and a prediction produced by the physical model described in Olamaie et al. (2012) based on a redshift of z = 0.412 (yellow).