Cumulative distribution of the time of coalescence for the Ran-Ceps that experienced a coalescence normalised to the t_tams of each individual Cepheid. Results for clusters with R_g = 8 kpc are plotted separately for the metallicity Z = 0.014 (red line), Z = 0.006 (green) and Z = 0.002 (blue). The approximate time when the stars are located within the Cepheid instability strip is indicated by the grey area.