Oscillation behavior of gas particles in the merger model 371 and snapshot 680 (i.e., 2.6 Gyr after the merger). Panels a and b give the ratio of the radial (and azimuthal) velocities to tangential velocities, respectively. In both panels, points and error bars give the median of the absolute values at five different radii. The colors in panel b indicate whether ΔAngle is negative (magenta) or positive (cyan). Panel c shows the radial evolution of ΔAngle, which is the difference between the disk-projected velocity vector and that of a pure circular motion. Points and error bars give the median of the absolute values at five different radii. Panels d and e provide the gas particle distribution within 300 × 600 kpc² and show the presence of a tidal tail on the right sides whose angular momentum is slightly tilted versus that of the remnant disk. The colors are the same as in panels a and b, respectively.