Comparisons of the ZAMS mass-remnant mass relation between the updated BSE (Sects. 2.1 and 2.2) and StarTrack. The comparison is done for the cases of B08, F12-delayed, and F12-rapid remnant-mass models and for the metallicities Z = 0.0002, 0.006, and 0.02, as indicated in the legends. In all cases in this figure, PPSN/PSN is disabled. In all panels, the black dashed line is the outcome from the new BSE and the blue solid line is the corresponding StarTrack result. The mass gap between NSs and BHs, which is characteristic of the F12-rapid remnant mass model, is also indicated in the corresponding panels (the grey, horizontal lines at ≈2.0 M_⊙ and ≈5.0 M_⊙ in the F12-rapid panels).