CO-HMS_RLO grid slice for a fixed M_BH ≈ 15 M_⊙, which is the remnant mass of the primary in the example models (M_1, ZAMS ≈ 32 M_⊙) from Figure 4. The star markers are the properties of the example models with q = 0.85 after the first supernova for different initial periods, where the coloring is the same as in Figure 4. The squares and circles are models with the same P_ZAMS and M_1, ZAMS but with q = 0.99 and q = 0.60, respectively. The markers and colors of the models from the CO-HMS_RLO grid are the same as in Figure 2, but here M_BH is fixed instead of M_donor. As P_ZAMS increases, the STAR+BH binaries move outside the SMT BBH merger regime.