V_i/V_circ at z = 0 as a function of radius in the simulations for V_i: σ (blue triangles), V_rot (red squares), s_0.5 (black crosses), s_1.0 (green asterisks) and S (pink diamonds). Each symbol represents the averaged value over the entire sample of galaxies (upper left panel) and the subsamples S1, S2 and S3 defined in Sect. 2.2 (upper right panel, lower left panel and lower right panel, respectively). The corresponding standard deviations are also shown. The radii are given normalised to R_bar in the main panels while in the insets, they are given normalised to R_max. The horizontal solid line indicates where V_i agrees with V_circ, while the dashed horizontal lines denote the range where V_i does not depart more than 20% from V_circ.