Mean power spectrum of the residuals (black) and its uncertainty (grey area) for 0° < |b| < 5° (top left panel), 5° < |b| < 30° (top right panel), 30° < |b| < 90° (bottom left panel) and for the whole sky (bottom right panel) against the input and output CMB (blue and red lines, respectively) and their uncertainties (blue and red areas, respectively). In all cases, the uncertainties are the standard deviation of each bin. The contribution of each foreground in the simulations through their power spectra is also plotted. The thermal dust is represented by the orange line, the PS and CIB by the pink and green lines, respectively, and the instrumental noise is shown by the brown line.