FLI map of the 3:1J MMR in the orbital planes of (329) Svea (left) and (142) Polana (right). The [a, e] domains are extended to the corresponding family ranges. The members of the families are plotted as white dots, while the position of the asteroids Svea (left) and Polana (right) appear as pink diamond-like shapes. In addition to the 3:1J MMR at 2.5 au, both charts show the presence ofother weaker MMRs, among which the 1:2 MMR with Mars at a = 2.42 au appears very successful in trapping asteroids from the Polana family, including the Polana asteroid itself. The migration results from the 3:1J MMR to the asteroids Phaethon, UD, and YC are given in the main text in Table 3 and panels c and d in Fig. 2.