Sky-distribution of gas densities (see vertical bar at right for colour-coding) for 41 HVCs in the barycentre direction with log nH measured from Si III, overlaid on the H I map with data from Westmeier (2018), which is based on the LAB survey (Kalberla et al. 2005, 2007). For purposes of display, HVCs along the same sightlines have been given an angular offset. The size of the dots scales with the HVC velocity. Important H I complexes are indicated.
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