Evolution of the injected TNO population over the first 1 Gyr after the stellar flyby (300 au initial disk size). Top: distribution of prograde (blue lines) and retrograde (red lines) TNOs as a function of periastron distance at 12 kyr (solid lines) and 1 Gyr (dashed lines). Bottom: distribution of inclination for the test particles remaining bound at 12 kyr, 100 Myr, and 1 Gyr, respectively.