A267 M(r) as derived from X-ray data (blue points with one sigma error bars; the solid blue line connects the profile points and is shown for the sake of clarity only) and from MAMPOSSt, using the King and NFW models for N(R) (hatched green region and dashed red lines, respectively), indicating the 1σ interval derived by randomly selecting 5000 r₂₀₀, r_s values of the NFW profile from the MCMC steps and taking the 16–84 percentiles of the mass values at 40 radial positions.