Dots: simulation results of the percentage of solar-type stars (0.8 M_⊙  < M_s < 1.2 M_⊙) located within 0.5 pc from the cluster center that have a single encounter with a periastron in the range 100–1000 AU as a function of cluster age for leaky cluster environments. The triangles shows the percentage of encounters closer than 100 AU. The solid and dashed lines show the equivalent estimates according to Eq. (2).