Evolution of β throughout a selected set of simulations, with the axis on the left. The shaded areas identify the value of the fit within 1σ (blue for the N-body runs, red for those with environment). We smoothed the data with a simple moving weighted average of width 2.5 Myr (5 model outputs). The black line shows the value of Ξ_tid of the environmental runs, as in Fig. 2 (axis on the right). The vertical dashed lines in the plots (b) and (e) highlight the moment of core collapse (see also Table 1). (a) R07_NoImf, (b) R07_Sal3, (c) R13_NoImf, (d) R13_Sal3, (e) R13_Sal6, (f) R30_Sal6.