Mass profile in terms of the critical surface mass density (computed at z_s = 3) for the solutions with the highest (case 1b in red) and lowest slopes (case 5a in blue) within a few kpc from the centre of the cluster. The red dash-dotted line and the blue dashed line are the total mass density profiles for each case. The black dash-dotted line surrounded by a red shaded uncertainty region (3σ) and the black dashed line surrounded by a blue shaded uncertainty region (3σ) are the dark matter density profiles in each case. Other models have not been included because their behaviour falls within the borders established by the two models plotted.