Relation between the environmental quenching probability and the stellar mass. In the top panel, we show a histogram with the percentage of quenched galaxies in different mass bins, separated into observed galaxies in red and simulated galaxies in orange. In the central panel, we present the individual values of P_Q as a function of the stellar mass, with symbols colour coded according to t₉₀. In the bottom panel, we show the distribution of P_Q as a function of the projected distance. For the observational sample, the symbols are the same as in Fig. 1, and the background points are the simulated galaxies from the Illustris Project. For all the observed galaxies, we include a black line that represents the mean P_Q in different mass bins, and a blue dotted line that shows the same fit but only for the galaxies of the Fornax cluster. For the simulated galaxies, the mean P_Q is represented by the dashed black line.