Comparisons of the ZAMS mass-remnant mass relation between the updated BSE and StarTrack including PPSN/PSN (F12-rapid SN model) for Z = 0.0001 and 0.002. The line legends are the same as in Fig. 1. Middle panel: PSN mass gap, as obtained from the current BSE for Z = 0.0001, by extending the ZAMS mass beyond 300 M_⊙. Bottom panel: between the ZAMS mass-remnant mass relations as obtained from the updated BSE (thick dashed lines) and StarTrack (thin solid lines) up to very large ZAMS masses, extending beyond the PSN mass gap (the black horizontal lines at 40.5 M_⊙ and 121.5 M_⊙), for a wide range of metallicities. The lower mass gap between NSs and BHs, which is characteristic of the F12-rapid remnant mass model, is also indicated in this panel (the grey, horizontal lines at ≈2.0 M_⊙ and ≈5.0 M_⊙).