Comparison of the angles between the magnetic field and velocity field along a magnetic field line. Panels (a) shows a field line from Figure 3b (white line), and seven green dots selected along it. Panel (b) shows a CHASE Hα blue-wing enhanced image at 14:45:55 UT. The green points are the projection of the points in panel a, while the orange points indicate the corresponding seven points along the jet used to calculate the velocity. Panels (c)–(d) show the inclination angle (θ) and azimuth angle (ϕ) of the magnetic field and velocity field at the selected points. The blue dashed line shows y = x, indicating that the inclination angle of the velocity equals that of the magnetic field.