Distribution of the post-CE orbital periods (P_orb) for the default population with the parameters in Table 2 including the core-envelope definition at X_H = 0.30 (blue histogram) and the population with the core-envelope definition at X_H = 0.01 (orange histogram). The populations are further split by the type of CO in the surviving binary, showing NSs (step) and BHs (hatched). The distributions have been weighted with the same factor that normalizes the maximum counts per bin for the NS-He post-CE binary population to 1.