Longitude-velocity diagram comparing γ-ray-measured velocities (crosses, including error bars) with other objects in our Galaxy. 26Al line-centroid energies were fitted to determine velocities in longitude bins of 12° and latitude ranges ±5°. For comparison, different models are shown (blue solid, red dotted, and green dashed lines), as well as the velocity information from molecular gas seen in CO (see Sect. 4 for details).
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