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Position-velocity diagram of $^{13}\rm{CO}$ and $\rm{HCO}+$ emission for BC\_21.25-0.15. filament 4.  Blue background shows $^{12}$CO (1-0) emission integrated between $-1^\circ < \textrm{b} < 1^\circ$ \citep{Dame_2001}. Black dots show GRS and BGPS sources associated with BC\_21.25-0.15. filament 4.  Colored lines show fits for the Scutum-Centaurus and Norma-4kpc arms (see text for references).