Surface density maps for the thin and thick disc stars (first and second columns, respectively) and all the stars in the disc (third column). The top panels show the xy (face-on) projection and the bottom panels show the xz (edge-on) projection of surface density. The blue and red shaded and unshaded regions indicate the selected particles at the end of the bar discussed in Sect. 5 and in Figs. 14 and 15 (see text).