Fig. 3
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NHI column densities in the Reticulum (Ret), Far Hydras (HyiF), North Hydras (HyiN), South Hydras (HyiS), East Dorado (DorE), West Dorado (DorW), Horologium (Hor), and the Magellanic clouds for optically thin HI. The faint column densities in the negative-velocity map (NegVel) are multiplied by 4 for display. The maps include a 5º-wide peripheral band around the analysis region (black perimeter) to account for the wings of the Fermi-LAT PSF in the γ-ray model.
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