Comparison of the σ₈ parameter estimated from the average power spectra of 300 simulations before and after the correction for leakage for (a) a Gaussian error distribution with σ₀ = 0.02, (b) a Gaussian error distribution with σ₀ = 0.05, and (c) a modified Lorentzian error distribution with γ₀ = 0.02. The dashed black line is the fiducial evolution of the σ₈ parameter used during simulations. The error bars on the parameters correspond to a single realisation.