Predicted and observed distribution of V-band magnitudes. The blue bars show the magnitudes of all OB star models (i.e. with HeS, WD, NS, and BH companion and unbound systems) after stable mass transfer. OBe candidates are marked with dots. As observations we show the SMC OBe magnitudes distribution (blue line) from Schootemeijer et al. (2022), the magnitudes of BeXBs (orange line) from Haberl & Sturm (2016)2, SMC X-1 (grey dashed line) and J0045-7319 (brown line).