Lagrangian radii at 50% (radius containing half of the mass: R₅₀[pc]) compared to evolution of simulation t=1 Gyr. Each curve shows the mean over five realizations per time step; the associated standard deviations are not shown, for visual clarity, but the last time steps are reported in Table 2. For panel (a), we considered a fractal radius of r_frac=50 pc. In the case of panel (b), we used r_frac=500 pc. The colored figures represent the Plummer radii R_Pl=50, 100, 250, 500 pc.