Left: ratio of the total C+ column density to that of the total gas column measured by adding HI (from 21cm data) and H2 (derived from CH and HF) as a function of Galacto-centric radius. The symbol size is proportional to the fraction of gas in molecular form ranging from ~0.1 to ~0.8 for the velocity intervals considered here, with each sight-line plotted with a different symbol. The weighted average (1.5 × 10-4) is indicated with a dashed line and the median value (1.25 × 10-4) with a dotted line. Right panel: comparison of the Herschel data (black symbols with source name) with the FUV absorption data from Parvathi et al. (2012) (gray dots with error bars). The gas-phase carbon abundance is plotted as a function of the logarithm of average gas density log 10( ⟨ n(H) ⟩ ) = log 10(Ntot(H) /L).
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