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Position-velocity diagram of CO, NH$_{3}$, N$_2$H$+$ and HCO$^+$ emission for BC\_11.13-0.12. filament 6.  Blue background shows $^{12}$CO (1-0) emission integrated between $-1^\circ < \textrm{b} < 1^\circ$ \citep{Dame_2001}. Black dots show HOPS, BGPS, and MALT90 sources associated with BC\_11.13-0.12. filament 6.  Colored lines show fits for the Scutum-Centaurus and Norma-4kpc arms (see text for references).