Variation of the minimum luminosity required to eject the test particle decreases with radial distance. Dashed (blue) curve is showing the variation in case of an “accreting” test particle in a spiral trajectory and solid black curve is showing the variation for a circular orbit initial condition (Fig. 5). In both cases the initial luminosity k₁ = 0.36 is fixed, (magenta) short-dashed curve is representing the ECS for final luminosity.