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Fig. 9.


Column density of neutral hydrogen (H I) as a function of dust extinction, AV, i.e. the dust-to-gas ratio. Blue filled circles again denote the GRBs with C I detected in absorption (empty blue circles show the GRBs with C I detected below the completeness limit). Black empty circles mark the GRBs in our sample without C I, where triangles represent bursts with upper limits on AV. The yellow squares show the quasar C I absorbers from Ledoux et al. (2015) and the green diamond symbols represent the quasar 2175 Å dust extinction feature absorbers from Ma et al. (2018). Overplotted are the average dust-to-gas ratios from specific sightlines in the Local Group (MW, LMC, LMC2 and SMC) from Gordon et al. (2003).

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