Power spectra involved in the Monte Carlo process. Shown is the theoretical 1D matter power spectrum computed by CLASS (dashed black line). Also shown (in red and blue, respectively) are the shell-averaged power spectra (in shells of width |k|−kf/2 < |k|< |k|+kf/2) showing the aliased version of the input power spectrum computed by the Boltzmann code and the corresponding power spectrum after transformation (B.12) (see Fig. 4 for details). All of them are plotted up to Nyquist frequency kN ∼ 0.67 h Mpc−1 with a setting of Ns = 256 and L = 1200 h−1 Mpc.
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