Fig. 5.

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Perturbed velocity field map caused by a lopsided halo potential model cube with a perturbation (a global m = 1 mode in the potential), projected in the X − Y plane. The perturbed velocity field map is clearly asymmetric. This model shows strong curvature of the iso-velocity contours on one side and weaker curvature on the other side. The HI kinematics is slightly lopsided. A perturbed potential can produce the asymmetric velocity fields.
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