Distribution of the last two chasers’ (n−1 and n) final distance (fd) with variable dis. The red dashed line means the imaginary final distance in the assumption that disturbance is not divergent. In this simulation, n = 500, f f = 10⁻⁵, v^o = 1.3, τ = 0.5 s, and time period is [0, 1000 s].