BH accretion rate for the two best models with double solar metallicity. The elements represented are the same as in Fig. 3. The qualitative form of the functions is related to the mass loss rate of the donor star by the relation Ṁ₂ = −βṀ₁. This is, for a higher value for β larger would be the accretion rate onto the compact object. The shaded area represents the zone below the likely upper limit for the mass accretion rate (⟨Ṁ₂⟩ = 4 × 10⁻¹⁰) given by ZZ18.