XLFs of the default population with the parameters in Table 2 showing the population with pre-RLO circularization at the periastron (blue lines), at an orbit with conserved angular momentum (orange lines), and at the binary separation of the pre-RLO eccentric orbit (green lines). The populations are further split by the type of mass transfer that occurred, RLO (solid line), and wind-fed accretion (dashed line). Be XRBs are shown with a dotted gray line, showing no effect as they are not circularized. AM stands for angular momentum.