The Galactic dust column (AV) plotted against the total equivalent hydrogen column density measured from soft X-ray absorption toward Swift GRBs (NHX). The best-fit limit to the population is plotted as a solid line with 1σ uncertainties as dashed lines and represents the Galactic relation between metals and dust: cm-2 mag-1, assuming AG89 abundances to convert the metal column to an equivalent hydrogen column density.
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