Fig. 7
Map of the column-weighted volume density along the line of sight, split into a) the 40−62 km s-1 component and b) the 62 to 75 km s-1 component. The similarity between the two figures is due to large line widths; the cut at 62 km s-1 is meant to highlight the low-density filament around ℓ = 49 and the clouds surrounding W51 Main.
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