Consistency of the noise angular power spectra from the half-ring difference maps (red), white noise covariance matrix (black dash-dotted line), and 10 000 full-noise MCs (grey band showing 50% quantiles, black solid line, and limits at 16% and 84% quantiles). From top to bottom we have TT, EE, and BB spectra for 30 (left), 44 (centre) and 70 GHz (right). Half-ring spectra are binned with Δℓ = 75 for ℓ ≥ 75.