Fig. 8
Scatter plot comparing the asymmetry parameter α of the fitted profile model to differences between the present fitted centre velocity vctr and the systemic velocities Vsys obtained by de Blok et al. (2008). The velocity difference is the same as that histogrammed in the upper panel of Fig. 7. Only the 19-member subset of THINGS galaxies examined by de Blok et al. is shown.
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