Number density of secondary critical lines (for z_s = 6) as a function of their equivalent Einstein radius θ_E. The results for the observational dataset are shown with the black histogram. The gray band indicates the range between the minimum and maximum number density among 100 cluster realizations obtained by randomly sampling the posterior distributions of the lens model parameters. The light blue and orange histograms show the results for the GADGET-X and GIZMO-SIMBA simulation datasets, respectively. For this figure only clusters with Einstein radii θ_E, p(z_S = 6) > 26″ in the redshift range 0.3 < z_L < 0.45 were used.