Initial density and free-fall time, t_eff, of the cluster derived by Shukirgaliyev et al. (2017) as a function of radius. The initial gas density (Eq. (5)) is shown in green, the final stellar density (Eq. (4)) in red, and the final gas density (Eq. (6)) in orange. The initial density profile is used directly in the simulation setup. The free-fall time, t_ff, of the initial gas density distribution as a function of radius is shown in (solid blue). The horizontal dashed blue line indicates the free-fall time corresponding to the average density, while the vertical dotted blue line marks the half-mass radius, r_h, of the initial gas distribution. The local value of t_ff is shortest in the central regions and increases significantly toward larger radii.