Top panel: one thousand averaged Cℓ values for simulated light cones using the shell method with error bars (red curve) and corresponding prediction (dashed black curve). We simulate here a light cone between redshifts 0.2 and 0.3 in a sampling Ns = 512 and a number of shells Nshl = 250 to ensure a sufficient level of continuity in the density field. The spherical Nyquist mode is situated around ℓN ∼ 650 and represented by the vertical reference. Bottom panel: relative deviation in percent of the averaged predicted Cℓ values with error bars in red.
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