Top panel: recovered errors on fσ₈ normalized to that obtained without tapering (equivalent to applying tapering with T_p = ∞), as a function of the tapering scale T_p used in the estimation of the precision matrix. This is obtained from the mocks at 0.5 <z < 0.7. Bottom panel: recovered maximum likelihood values for fσ₈ and associated 1σ error as a function of the tapering scale T_p.