Eccentricity at binary formation (e_b) as a function of the initial galactic merger orbital eccentricity (e₀). We use different colours to distinguish between data relative to the first (red), the second (blue) or the third (green) BHB of a tree. Empty and filled dots represent data from the LR and HR runs, respectively. The empty black squares are data from our previous work (Fastidio et al. 2024), whose resolution is comparable to our LR runs. The shaded red area highlights the region where e₀ > 0.9