gnomonic projection of the sky centred at high latitude (l,b) = (90°,−80°). Top left: Planck 353-GHz map. Top right: CMB-removed Planck 353-GHz map. Middle left: dust model P13 at 353 GHz (MBB fit on CMB-removed Planck maps). Middle right: GNILC dust map at 353 GHz. Bottom left: dust model P15 at 545 GHz (Commander Bayesian fitting). Bottom right: GNILC dust map at 545 GHz. Maps at 353 GHz are shown at 5′ resolution, while maps at 545 GHz are smoothed to 7.5′ resolution. The GNILC dust maps have a non-uniform resolution (see Fig. 2) with 5′ resolution kept in regions of bright dust emission. In each image the local mean intensity has been subtracted for this comparison.