Example of the results from the FGBuster component-separation runs. Two instrumental configurations are considered: the baseline M0 (blue) and the high frequency extension M3 (red). The solid lines represent the post-component-separation noise and foreground residuals S_ℓ, computed by averaging 1000 simulations for the baseline, and averaging 10 simulations for the extension. Together with the power from gravitational lensing and primordial B-modes, they define the error bars on the CMB power spectrum (boxes).