Probability of emergence per unit time, per unit area and per flux ratio bin (P) as a function of the ratio between the emerged flux and the azimuthal flux underlying the emergence site (r). The different colours correspond to the ranges of azimuthal flux density represented in Fig. 7. The numbers in the legend refer to the mid points of the azimuthal flux ranges. The stripes in the background indicate flux ratio bins of width 0.1.