Notes. N_par and DoF are the number of model free-parameters and degrees-of-freedom. Δ_rms is the root-mean-square displacement between the positions of observed and model-predicted multiple images (see Eq. (5)). The BIC (Bayesian Information Criterion) and AIC (Akaike Information Criterion) values are computed using Eq. (6). The value, defined in Eq. (11), quantifies the agreement between the model predicted and measured cluster member velocity dispersions. In the last column, we summarize the differences of the mass parametrization in the four lens models. The reference model selected on the basis of the best figure of merits (from column four to seven) is indicated in bold.