Upper panels: rotation curves for two typical simulated galaxies G1 and G2 (left and right panels, respectively) at z = 0 with different fractions of gas supported by rotation (). The total circular velocity is shown with a solid line. The circular velocities contributed by the gas, stellar, baryonic and dark components are represented with dotted, dot-dashed, dashed and long-dashed lines, respectively. The mean rotation curve (diamonds) and the mean dispersion velocity curve (squares) for the gas-phase are also plotted. The vertical lines indicate the baryonic radius (R_bar) and the radius where the mean rotation velocity reaches a maximum value (R_max). Lower panels: gas (solid lines) and stellar (dashed lines) mass in the spheroidal (red) and disc (blue) components as a function of radius, normalised to the corresponding total gas or stellar mass within 3   R_bar. The vertical line depicts R_bar.