Velocity fields for pebbles in an unperturbed gaseous disc, calculated by Fourier-decomposing the planet’s potential (as explained in Appendix A). Here, a 10 M_⊕ planet is embedded at 1 AU around a 1 M_⊙ star. Two Stokes numbers, St = 0.01 (left) and St = 0.1 (right), as well as two different softening parameters, λ = 0.005 (top) and λ = 0.0075 (bottom), are shown. The darker shade indicates the accreted pebbles, the dash-dotted green circle indicates the Hill radius, and the dashed red circle indicates the accretion radius R_acc. Only one in five trajectories of the non-accreting pebbles is plotted to avoid overfilling the figure with streamlines.