Averaged 3D power spectrum compared to the expected 3D power spectrum, for 1000 realisations of the density field. The shell-averaged monopoles of this residuals in shells of width |k|−kf/2 < |k|< |k|+kf/2 were then computed. The result is presented as percentage with error bars. The setting used is a sampling number per side of 256 in the top panel and 512 for the other, all in a box of size L = 1200 h−1 Mpc at redshift z = 0. Both results are computed up to the Nyquist frequency.
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