X-ray–ϕ cross-correlation angular power spectrum, measured between Planck CMB lensing full-sky map and a RASS data reprojected on the full-sky (black sample); the same cross-spectra when masking NVSS sources is shown as grey samples. The red solid line shows the theoretical prediction assuming (σ₈ = 0.8, Ω_m = 0.3, b_H = 0.2), the green dashed line shows the two-halo term contribution, and the blue dashed line the one-halo term contribution. The solid cyan line displays the contribution from AGN–ϕ cross-correlation.