Profile of the total density ρ (blue) and the drift velocity (orange) and dust ratio (dotted green) for the 12 μm dust grains in the fiducial model 256MRN. The density is normalised by its initial value. The norm of the drift velocity with respect to the barycentre is normalised to 1 km s⁻¹. The variations in dust ratio are computed with respect to its initial value. The quantities are plotted against the x-axis at a random time (>2t_cross) and at a random location in the yz-plane. Regions with positive relative dust ratio correspond to dust-enriched material.