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\textit{Top}: Position-velocity diagram of CO, NH$_3$, and HCO$^+$ emission for filament 1. Blue background shows $^{12}$CO (1-0) emission integrated between $-1 < \textrm{b} < 1$ degrees \citep{Dame_2001}. Black dots show GRS sources associated with filament 1. The black lines are fits to CO data for the Scutum-Centaurus arm, from \citet{Dame_2001} and \citet{Shane_1972}. \textit{Bottom}: Plane of the sky map integrated between 55-75 km/s, the approximate velocity range of the Scutum-Centaurus arm in the region around Filament 1. A trace of Filament 1, as it would appear as a mid-IR extinction feature, is superimposed on the CO emission map. The correlation between Filament 1's mid-IR extinction feature and the Scutum-Centaurus***INVALID BYTE SEQUENCE HERE***s Scutum-Centaurus's  arm most intense CO emission hints that filament 1 may be a spine of Scutum as traced by lower density CO gas