Marginal posterior from mock data displaying a similar degeneracy to the real KiDS-1000 data (compare with Fig. 6). The input values for σ₈ and Ω_m are shown with the dashed lines. These are results for one of the 100 mock realisations that we analysed. In the same set of realisations we find a number of similar results, with shortened contours for one or more of the statistics.