Surface density of simulated particles for the case of β = 0.02 (all planets present). The relative surface density is a 2D-histogram of the particle distribution, recorded in a frame co-rotating with Earth (top) and Venus (bottom), that is then normalised to a background density that arises under the absence of the inner planets. Histogram bin size is 0.02 au × 0.02 au. Structures revolving with an orbital period different from the observed planet are washed out azimuthally. The density distributions for Earth and Venus are thus presented separately. In the case of Venus (bottom) the colour scale has been changed to bring out the fainter structure. Other particle β are given in Figs. A.1 and A.2.