(U − B) colour and the fraction of blue, red and green galaxies as a function of different environmental characteristics in three redshift bins (as in Fig. 4). Top left: nearest-neighbour density log (1 +δ₃); top right: number of neighbours log N_{1 Mpc}; bottom left: mean harmonic radius R_H; bottom right: dimensionless crossing time t_cH₀. Each plot is divided in mean (U − B) (top panels) and colour fractions (bottom panels), f_blue (blue solid boxes), f_red (red open symbols) and f_green (green crosses). See text for the definition of colour fractions. The error bars represent the 1σ spread in each bin. The dashed lines are least-squares fits to the data points.