Angular power spectrum of the full eRASS AGN sample (soft band, four years) for the extragalactic sky (fsky ≈ 0.83) and 0 < z < 5. The grayshaded area and the blue histogram show the 1σ uncertainty region (Eq. (4)) without and with ℓ-binning, respectively. The horizontal dotted line shows the level of shot noise, which was already subtracted from the angular power spectrum. For multipoles above the vertical dashed line (representing lmax ≈ 500) our assumption of a linear clustering starts to break down. Therefore, we did not consider these multipoles in our subsequent calculations.
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