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\section{Filament 4 ("BC\_021.25-0.15")}  Filament 4 is not a confirmed bone, receiving a quality grade of "C." It weakly satisfies our criterion 4 and appears to be an interarm filament, lying filament that lies  between the Scutum-Centaurus and Norma-4kpc arms, in \textit{p-v}. With an aspect ratio of $40:1$, it also fails our criterion 6. Finally, it only weakly satisfies our criterion 1 (largely continuous mid-infrared extinction feature), as there is a small break in the feature near the middle of the filament.