Velocities of the 36 individual slits with good velocity estimates. The individual spectra are plotted as large coloured points with colours representing their velocities. The legend at the top left is given is km s^-1. The orientation has been chosen to correspond to that of Fig. 1, so that north is down and east is to the left. Large circles delineate the bin edges used in Fig. 3 at 67′′, 110′′ and 150′′.