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\label{fig:ragan_comp}: \texit{Top:} Position-position analysis of BC\_18.88-0.09, as it compares to GMF20.0-17.9. In green, we show 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 the a  path connecting that connects  the \citet{Ragan_2014} IRDCs that also and  traces BC\_18.88-0.09. \textit{Bottom:} We show the results of performing a slice extraction along the red path in the upper panel. Using Glue, we link spectral p-p-v cubes from the GRS survey with GLIMPSE-Spitzer mid-infrared images and  extract velocity as a function of position along the path.