Comparison between the v_sky derived with three different methods for each of the galaxies of our sample (lower row, diamonds) and the corresponding total velocities (upper row, hexagons), connected by the dashed lines. The three methods are: the best-fit velocity V derived from the 400 MHz profile (blue), v_sky = v_los (red), and v_sky = v_avg (green). The vertical dashed line shows the value of σ_cl.