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.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.