Whole sky map at four frequencies showing the narrow inner Galaxy emission: a) the 408 MHz map of Haslam et al. (1982); b) the 28.4 GHz map from Planck; c) the 70.4 GHz map from Planck; and d) the 545 GHz map from Planck. The colour scales are logarithmic, and the maps are in Mollweide projection.
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