View of the l = 29° field (the coordinates are galactic coordinates). In red is given the 13CO emission at velocities between 75 and 85 km s-1 showing the possible molecular annulus (white circle) and in green the PACS 70 μm emission. Black circles show H ii regions (the size of the circles corresponds to the physical size, see e.g. Anderson et al. 2009) with known velocity. The colours of the source velocities correspond to: black: probable association with W43 for sources around 94 km s-1 (~5.8 kpc) and association with Sh2-65 for sources around 51 km s-1 (3.3 kpc), blue: tangent distance (~7.4 kpc), green: far or tangent distance (e.g. ~12.4 kpc for sources ~ 20 km s-1, ~7.5 kpc for sources ~95 km s-1), magenta: near distance (~5.3 kpc) and red: probable association with G29.96-0.02 (near distance, ~6.2 kpc).
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