Top: angular CMB temperature power spectrum, , as derived by COSMOGLOBE (black), BEYONDPLANCK (green), Planck (red), and WMAP9 (blue). The best-fit Planck 2018 ΛCDM spectrum is showed in dashed gray. Middle: residual power spectrum relative to ΛCDM, measured relative to the quoted error bars, . For pipelines that report asymmetric error bars, σ_ℓ is taken to be the average of the upper and lower error bar. Bottom: fractional difference with respect to the PlanckΛCDM spectrum. In this panel, each curve has been boxcar averaged with a window of Δℓ = 100 to suppress random fluctuations.