353 GHz maps of band-average unit conversion and dust colour correction (see Sect. 3.4). The maps show the deviation in the combined unit conversion and colour correction from the full-sky map median values. The full-sky median coefficient values, i.e., offsets, used for the Full a), b), c), Nominal d), e), f), First g), h), i), and Second j), k), l) surveys are: 278.980, 278.970, 278.960, and 278.970 MJy sr^-1 K_CMB, respectively. The figure columns represent the ecliptic polar maps for the LMC a), d), g), and j), CHA b), e), h), and k), and NEP c), f), i), and l) regions of the sky.