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Top: Position-velocity diagram of CO and NH3 $\rm{NH}_3$  emission for BC\_357.62-0.33. Blue background shows 12CO (1-0) emission integrated between −1black colored  lines are fitsto CO data  for the Scutum-Centaurus arm, from Dame et al. (2011). arm (see text for references).  Bottom: Plane of the sky map integrated between -15-0 km/s, the approximate velocity range of the Scutum-Centaurus arm in the region around BC\_357.62-0.33. A trace of BC\_357.62-0.33, as it would appear as a mid-IR extinction feature, is superimposed on the CO emission map. The correlation between BC\_357.62-0.33’s mid-IR extinction feature and the Scutum-Centaurus’s arm more intense CO emission hints that BC\_357.62-0.33 may be a spine of Scutum as traced by lower density CO gas