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\label{fig:skeleton}: \label{tab:skeleton}:  A position-velocity space summary of Bone candidates and spiral arm models. Blue background shows $^{12}\rm{CO}$ emission from \citet{Dame_2001}, integrated between $-1^\circ < b < 1^\circ$. Black dots show measurements of BGPS, HOPS, MALT90, and GRS-determined velocities, with particular candidate filaments identified by numbers (see table \ref{fig:candidates} for further identification), or, in the case of Nessie, by name. Lines of varying color show predicted \textit{p-v} spiral arm traces from the literature (see text for references).