Divergence of the diffusion flux, div(ℱ_tot), predicted by the degenerate Landau Eq. (26)for the razor-thin quasi-Keplerian disc introduced in Sect. 2.2. Red contours, for which div(ℱ_tot) < 0, correspond to regions from which the wires will be depleted, whereas blue contours, for which div(ℱ_tot) > 0, are associated with regions in action space, where the value of the disc’s DF will increase during the resonant relaxation. The contours are spaced linearly between the minimum and the maximum of div(ℱ_tot). Within the units of Eq. (6), the maximum value for the positive blue contours is given by div(ℱ_tot)_max ≃ 5 × 10^-14, while the minimum value for the negative red contours reads div(ℱ_tot)_min ≃ −10^-13.