1D distributions of the orbits trapped into the bar over the time interval t = 300 − 400, which were flat (J_z < 0.05) at t = 300 (the same orbits as in Fig. 2): The three left plots display the secular frequency ratio ω_z/κ at t = 300, 400, and 500, respectively. The two right plots correspond to the secular vertical action J_z at t = 400 and t = 500. The gray lines show the distributions of all trapped orbits, and the other colors indicate orbits with different behaviors (the same as in Fig. 3) at t = 500.