81P/wild 2 last 100 yr. fraction of surviving clones (%) versus time from now (yr). The colors represent the regions visited by the test particles (red: Jupiter family region; cyan: Centaur). The dashed line marks the bars with a confidence level equal or larger than 90% of the clones in the Jupiter family region. The resolution is 3 yr, and the number of the initial test particles is N = 100.