x–y distribution of the young stars (blue points, age < 200 Myr) and the intermediate-age stars (red circles, age 200–400 Myr) at simulation time t_sim = 626 Myr of the TI-fid model (left) and the RP-fid model (right). The x–y distribution of the disk gas (density > 0.01 H/cc) is shown with gray shading and a darker gray outer contour line to highlight the extent of the disk gas. In the left panel, the trajectory of the secondary galaxy is marked with a symbol at intervals of 37 Myr. In the right panel, the ram pressure wind is blowing from right to left, along the x-axis.