Position-velocity diagram along the kinematic major axis. The systemic velocity of the rotating disk is set at V_LOS = 0 km s⁻¹. The color scale and the blue contours show the observed [C I] (2−1) data. The red contours and yellow dots show the best-fit rotating disk model and the rotation velocity projected along the line of sight, respectively, assuming a constant velocity dispersion (σ_v = 47 km s⁻¹). The contour levels are at S/N = ( ± 2, 3, 5), and negative contours are shown with dashed gray lines.