Left panel: final mass for compact objects as a function of the ZAMS mass adopted in this work (straight thin red line) in comparison with Ze20 (dashed thick black line), SM17 (dashed thick light-green line), and Be02 (dashed thick light-blue line) models. The light-gray area encompass the supposed lower mass gap, whereas the dark-gray area labels the mass gap featured in our models. Right panel: NS mass spectrum adopted in this work (thick red line) compared with Ze20 (black steps), SM17 (dashed green steps), and Be02 (filled blue steps).