Fig. 2
Example of a symmetric H i profile: CIG 266, Aflux ratio = 1.05 ± 0.05. The points where the horizontal (black) line intersects the profile correspond to the low (Vl) and high (Vh) velocity ends at a 20% level with respect to the peak. The derived mean velocity (Vm) at a 20% level is plotted as a (red) point.
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