Velocity fields derived from different 3D kinematic models and the observations. The rotation curve used to build the models is shown in the inset on the left (x-axis: radius in arcsec, y-axis: rotation velocity in km s-1). Contours range from 140 to 181.6 km s-1, with steps of 5.2 km s-1. The circles show the beam size (10′′). See Sect. 3.1 for details.
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