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We show the results of performing a slice extraction along the filamentary extinction feature of BC\_21.25-0.15. BC\_21.25-0.15, which corresponds to the black line in the plane of the sky map below.  Using Glue, we link spectral \textit{p-p-v} cubes from the GRS survey with GLIMPSE-Spitzer mid-infrared images and extract velocities \textit{along a path tracing the entire extinction feature}. We confirm that BC\_21.25-0.15 is velocity coherent as traced by lower density CO gas from the GRS survey.