gnomonic projection of the sky centred at high latitude, (l,b) = (90°,−80°). Left: difference map (Planck 353 GHz −Planck CMB −GNILC dust) reveals the CIB anisotropies at 353 GHz. Middle: difference map (Planck 353 GHz – Planck CMB – dust model P13) revealing only the instrumental noise because the dust model P13, like the Planck observations at 353 GHz, still contains the CIB signal. Right: difference (dust model P13 – GNILC dust) revealing the amount of CIB contamination in the dust model P13 with respect to the GNILC dust map. In these images, the local mean intensity of each map has been subtracted.