Collision time, t_coll, as a function of stellar mass, M_⋆ (Eq. (1)), for three different values of the black hole number density, n_•. The horizontal dot-dot-dashed purple and dark blue lines denote the collision times of 5 Myr and 55 Myr for the representative O and B stars of masses 50 M_⊙ and 10 M_⊙ (indicated by the vertical dotted brick-red lines), respectively, derived for n_• = 2 × 10⁸ pc⁻³. In all cases, the velocity dispersion is set to the orbital (circular) velocity around Sgr A^⋆ at the representative distance of 0.015 pc from Sgr A^⋆ and the mass-radius relation of Demircan & Kahraman (1991), R_⋆ = 0.85 M_⋆^0.67, is assumed.