Spatial distribution of RGB and RC stars with 20.7 mag  < I <  24.6 mag in the southern fields. The resolution of the map is 1′  ×  1′ , smoothed with a gaussian kernel of FWHM five pixels (shown at the bottom-left corner of the figure). The colour scale indicates the number of stars per pixel. The stellar distribution is compared to the Hi complexes detected in this region. Contours are drawn at 3 to 10.5 × 10¹⁸ cm^-2 in steps of 1.5 × 10¹⁸ cm^-2.