Fig. 1
Left: Planck map at 857 GHz over the area where we have Hi data from the GASS survey. The center of the orthographic projection is the southern Galactic pole. Galactic longitudes and latitudes are marked by lines and circles, respectively. The Planck image has been smoothed to the 16′ resolution of the GASS NHI map. Right: GASS NHI map of Galactic disk emission, obtained by integrating over the velocity range defined by Galactic rotation (Sect. 2.2.2).
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