Evolution of half-number radius of the tail for models of different values of the initial velocity dispersion (cf. Table 2). The semi-analytical solution (Eq. (22)) is plotted as dashed lines. The result of Eq. (22) is scaled to v_e = 4 km s⁻¹ for model C10G13, and then decreased by a factor of N^0.5 for models labelled C10G13R“N” to scale with the initial velocity dispersion of the cluster.