Left panel: attenuation AV versus the Fe II column density into dust. Red stars are for the C I-selected sample, blue triangles correspond to the data from Vladilo et al. (2006), green crosses and orange points are for samples of local interstellar clouds from Snow et al. (2002) and Jenkins et al. (1986), respectively. The blue dashed line is a linear regression of the Milky Way (MW) data with fixed unit slope (see Vladilo et al. 2006). Right panel: the dust-to-gas ratio minus metallicity is plotted against metallicity.
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