MCMC results for the LEGACY targets, using different prescriptions of the surface effects described in Table 3. The runs with convergence issues were manually discarded. The modelling of Barney was more challenging, and MCMC runs converged successfully only with the BG2 surface effect prescription. For each target, three sets of classical constraints were considered: set 1 (bottom line), set 2 (middle line), and set 3 (upper line). The grey boxes represent the observational constraints.