Fig. 5.
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Visual extinction (AV) vs. H I column density (NHI), i.e., the DTG ratio. The symbol notation follows Fig. 3. For comparison are overplotted the average DTG ratios from specific sightlines in the Local Group (MW, LMC, LMC2, and SMC) from Gordon et al. (2003). GRBs typically probe sightlines with lower AV for a given NHI than the local galaxies.
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