Pebble flux F_peb inside the planetary gap (1 au, upper panel) and outside the planetary gap (30 au, lower panel) for a disc with a 100 M_⊕ planet at 10 au. Solid lines correspond to full simulations, while dashed lines show those where dust has been initially emptied out inside of the gap. The different shades indicate different simulations with δ_turb = 10⁻⁴ and varying viscosity, which sample well the different blocking efficiency regime. Low viscosity (α_visc = 10⁻³) is highly blocking, while strong viscosity (α_visc = 10⁻²) are highly permeable.