Fig. 7

Left: gas density map showing the locations of terminal l-o-s velocity points (white circles). The black circle indicates the positions of the tangent points. The reference position is (x,y) = ( − 8,0) kpc. Right: comparison of the distance (top) and velocity (bottom) of the tangent points with the true distance and velocity of the terminal velocity points. Δd = dT − d where is the distance to tangent points and d the true distance to terminal velocity points. Δv = v(R) − vφ, where v(R) is from Eq. (2) and vφ is the true azimuthal velocity of terminal velocity points.
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