Fig. 4
Velocity and distance transformations toward W31. Left and middle: LSR velocity vs. galactocentric distance R and line of sight distance ρ for a flat rotation curve with R0 = 8.5 kpc, Θ(R) = 220 km s-1. Right: the galactocentric distance-line of sight distance relationship for R0 = 8.5 kpc. The locus of W31 based on the 4.95 kpc distance measured by Sanna et al. (2014) is noted in all panels.
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