Planck 2013 results
Free Access

Fig. 3


Masks used to estimate the zero levels of the maps. Left: “low NH i mask” including pixels of the sky where the LVC column density is <2 × 1020 cm-2 and the IVC column density is below <0.1 × 1020 cm-2. Right: mask where the total H i column density (LVC plus IVC) is lower than 3 × 1020 cm-2.

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