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Position-velocity diagram of $^{13}\rm{CO}$ emission for BC\_11.13-0.12. BC\_21.25-0.15.  Blue background shows $^{12}$CO (1-0) emission integrated between $-1 < \textrm{b} < 1$ degrees \citep{Dame_2001}. Black dots show GRS sources associated with BC\_21.25-0.15. Colored lines show fits for the Scutum-Centaurus and Norma-4kpc arms (see text for references).