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\textit{Top}: Position-velocity diagram of CO and NH$_{3}$ emission for filament 9. BC\_335.31-0.29.  Blue background shows $^{12}$CO (1-0) emission integrated between $-1 < \textrm{b} < 1$ degrees \citep{Dame_2001}. Black dots show HOPS sources associated with filament 9. BC\_335.31-0.29.  The black lines are fits to CO data for the Scutum-Centaurus arm, from \citet{Dame_2011}. \textit{Bottom}: Plane of the sky map integrated between -50-30 km/s, the approximate velocity range of the Scutum-Centaurus arm in the region around Filament 9. BC\_335.31-0.29.  A trace of Filament 9, BC\_335.31-0.29,  as it would appear as a mid-IR extinction feature, is superimposed on the CO emission map. The correlation between Filament 9's BC\_335.31-0.29's  mid-IR extinction feature and the Scutum-Centaurus's arm more intense CO emission hints that filament 9 BC\_335.31-0.29  may be a spine of Scutum as traced by lower density CO gas