Top left panel: C/M ratio as a function of azimuthal angle for each of the segments shown in Fig. 13. The inner segments, 0−2 kpc (red squares), and the outer segments 2−4.5 kpc (black triangles) are shown separately. Bottom panel: C/M ratio as a function of distance from the galactic centre. The solid black line is a weighted linear fit to all four points, the red dashed line is also weighted but is only fitted to the first three points. Right: the same information is presented in the right hand panels for the [Fe/H] abundance, derived from the C/M ratio using the relation of Cioni (2009).