Distributions of orbital periods (P_orb) at the end of the SN for the progenitors of BH XRBs, for the default population with the parameters in Table 2, including the population with BH mass normalized SN kicks (solid blue), the population with fall-back normalized SN kicks (hatched orange), and the population with no normalization on the SN kicks (hatched green). The distributions have been weighted with the same factor that normalizes the maximum counts per bin for the default population (BH mass normalized kicks shown in solid blue) to 1.