Corner plots showing the posterior distributions of the main cluster parameters for the SL+X-ray fit (black) and for the SL only fit (violet): ellipticity e, position angle θ, core radius r_core and velocity dispersion σ of the DM mass distribution; velocity dispersion of the BCG σ_bcg and strength of the external shear γ_ext. We also show in green the results obtained by fitting the SL constraints while including the description of the X-ray component derived in Section 4.2.1 from the X-ray only fit. The RMS is equal to 0.43″ in all cases.