Accretion of pebbles with τ_f = 0.1 by the central core (μ_c = 10^-5) in the drift regime. The colour coding shows the local particle surface density Σ_p, normalised by the average particle density , in the simulated shearing box with Z = H_p/H = 0.01. Marked as a white dot, the central seed core can be seen in the first panel. Both the drift and Hill radii are plotted as white circles. The second panel illustrates the drift of the particles (Δ = 0.05) and creation of an accreting particle wake. In the third panel, particles within the drift radius r_d ≈ r_B are accreted. Particles further out may be carried out of the box by the sub-Keplerian gas or by the Keplerian shear. In the final panel the headwind has blown most pebbles past the core, with only a minority accreted.