Fraction of test particles remaining bound to their parent star (Star 1), being captured by the perturber (Star 2) and becoming unbound during a flyby. Here, the case of a coplanar, prograde flyby at a periastron distance of 100 AU is shown. The different panels show the results for the following mass ratios between the perturber and the parent star: (a) M₂₁ = 0.5, (b) M₂₁ = 1.0, and (c) M₂₁ = 5.0.