Fraction of z_ph ≤ 0.40 galaxies in the Deep 1 (Ilbert et al. 2006) field as a function of their g′ − r′ and r′ − i′ colours and r′ magnitude. Each panel shows a dodecile of the photo-z catalogue, i.e. one of twelve equally populated magnitude bins, where the k-th dodecile includes all galaxies . In each panel, the number N_ij of galaxies within cells of mesh size Δ(g′ − r′) = Δ(r′ − i′) = 0.1 is shown, using the same grey scale . White grid cells are empty. The red, green, and blue contours enclose regions in which 25% (50%, 75%) of galaxies have a z_ph ≤ 0.40. Based on the distribution of z_ph ≤ 0.40 galaxies in the three brightest dodeciles, we define the yellow polygon (see Table B.1), in order to remove foreground galaxies from the CL 0159+0030 and CL 0809+2811 fields.