Notes. We report the key times in our simulations: (i) the initial time of the galactic mergers (t₀); (ii) times of binary formation (t_b); and (iii) coalescence times (t_coal). Here t₀ = 0 is the time at which the first galactic merger of each tree is initialised. The cosmological time of the first merger of each tree can be obtained from redshift values shown in Table 1. We report t₀, t_b, and t_coal of each BHB formed in the simulated merger trees, both at low and high resolution (LR and HR). The ‘/’ sign denotes simulations that have not finished running; the ‘x’ below the ‘3rd BHB’ column refer to trees that contain only two mergers; (T) means that the system forms a triplet. Finally, ⁽¹⁾ indicates that t_coal has been computed using Eq. (11).