Percentage of captures as a function of initial inner BH radius (r_i) and initial radial separation (Δr_i) for two mass pairs, On the left panel, log(M₁/M_⊙) = 3.9 and log(M₂/M_⊙) = 4.7, on the right panel, log(M₁/M_⊙) = 5.6 and log(M₂/M_⊙) = 6. Red areas represent initial captures while blue areas dynamical captures. The black lines indicate the limits within which core stalling can position our BHs, given the mass range studied. The black crosses indicate where core stalling would position the BHs in each case.