Fig. 5
Galactic abundance of CO and 
emission vs. galactocentric distance for a flat rotation curve with R0 = 8.5 kpc and Θ0 = 220 km s-1. The dashed histogram of the abundance labeled LBX 1984 is from a re-analysis of the survey data of Liszt et al. (1984) and the dash-dotted histogram for CO labeled PLVG 2013 was transcribed from Fig. 7 of Pineda et al. (2013). The color coding is as in previous figures.
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