Core collapse time t_cc divided by the crossing time t_cross for clusters with N = 1000 (blue circles) and N = 10 000 (red circles) as a function of q = M_ext/M_stars. We also plotted two relations that scale as (1 + q)⁴ which fit our data and therefore suggest that if the core collapse time is proportional to the relaxation time of the cluster, then the relaxation time scales as (1 + q)⁴, which is the same relation that we derive in Appendix A.