Ratio of the number of active over passive galaxies (f_ap) in LD (light grey) and HD (dark grey) regions in the Rmocks (filled symbols) and in the Vmocks (empty symbols) in the same stellar mass bins and redshift ranges as in Fig. 5. In each mass bin, for the environment with fewer galaxies (HD for log (ℳ/ℳ_⊙) < 11.29, LD otherwise) we plot f_ap as computed directly from the mock catalogues, while for the environment with more galaxies we plot f_ap derived from the mass-matched samples. For not mass-matched values, symbols are centred on the y-axis on the mean value of f_ap of the 16 mock catalogues, and their height represents the rms around the mean. For mass-matched values, the y-axis position is computed as follows: first we compute the mean f_ap of the 100 mass-matched samples in each mock catalogue, then we average the 16 mean values. The height is given by the rms around this mean. For all symbols, the extension on the x-axis indicates the span of the stellar mass bin. For log (ℳ/ℳ_⊙) > 11.29, we show f_ap only for the Rmocks because the statistics in the Vmocks at these stellar masses is too low (see text). In each panel, the vertical and horizontal lines are the same as in Fig. 5.