 ![Instrumental noise map and [*Planck*]{} Galactic mask (extended to cut out $\pm00^\circ$ of the Galactic plane) employed in the simulations. The noise map corresponds to 0.0$\mu$K.arcmin, as expected for the 00-GHz band. The Map is in Galactic coordinates and at resolution of $\simeq 0.0$arcmin, corresponding to [HEALPix]{} $N_{\rm side}=0000$.[]{data-label="fig:instnoisemap"}](