Comparison between maximum rotational velocities estimated from the circular rotation velocities V _t (r), and the c ₁(r) velocities from the harmonic model. Every point here represents one individual object. The black straight line represents the 1-to-1 line. The inset panel shows a violin plot of the difference between both velocities, i.e., ﹩{\rm{\Delta }}V={V}_{\max ,c1}-{V}_{\max ,t}﹩. The dispersion of the difference is 5 km s⁻¹.