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\label{fig:ragan_comp}: \textit{Top:} Position-position analysis of BC\_18.88-0.09 (this paper), as it compares to the (larger) feature known as GMF20.0-17.9 \citep{Ragan_2014}. In green, we overlay the GRS $^{13}\rm{CO}$ integrated intensity contours that \citet{Ragan_2014} uses to define GMF20.0-17.9; they group several neighboring IRDCs into a single filament. In the boxed yellow region, we show our BC\_18.88-0.09, a subset of GMF20.0-17.9. In red, we show a path that connects the \citet{Ragan_2014} IRDCs and traces BC\_18.88-0.09. \textit{Bottom:} Position-velocity analysis of BC\_18.88-0.09, as it compares to GMF20.0-17.9. We show the results of performing a slice extraction along the red path in the upper panel. Using Glue, we link spectral \textit{p-p-v} cubes from the GRS survey with GLIMPSE-Spitzer $8\mu\rm{m}$ images and extract velocity as a function of position along the path. As seen inside the yellow boxed region in the lower panel, the section of the path that corresponds to BC\_18.88-0.09 is remarkably kinematically coherent, with velocities ranging between 45 and 49 km/s. In contrast, \citet{Ragan_2014} group the 37 km/s emission at x=0 pc with the 50 km/s emission at x=115 pc and connects these two points with a straight line on a longitude-velocity diagram. Whereas our filament has a shallow negative slope in \textit{p-v} space, the \citet{Ragan_2014} filament has a steeper positive slope, which bisects the Scutum-Centaurus arm perpendicularly diagram (green line  in lower  \textit{p-v} space \citep[figure 4;]{Ragan_2014}, thus appearing to be a spur, rather than a spine, of this arm. panel).