From top to bottom, density distribution of: carbon-rich stars, oxygen-rich stars, the C/M ratio and RGB stars. Each row shows, on the left a map of the full observed area using 1600 bins and on the right a map of the central 34′ × 34′ also using 1600 bins. Contours are at: 0.1, 0.5, 2, 10 and 15 for carbon-rich stars in low resolution map and 0.5, 2, 5 and 8 in the high resolution map. For oxygen-rich stars contours are at: 1, 2, 5, 10, 25 and 50 in the low resolution map and 0.5, 1, 5 and 10 in the high resolution map. For the C/M ratio the contours are at: 0.1, 0.4, 0.6, 0.8 and 1 in the low resolution and 0.1, 0.4 and 0.8 in the high resolution map. For the RGB stars contours are at: 1, 2, 5, 10, 20 and 50 in the low resolution map and at 1, 3, 6, 11 and 15 in the high resolution map. At a distance of 490 kpc, the full field is 14.5 × 14.5 kpc², whilst the high resolution field is 4.85 × 4.85 kpc².