The Galactic H i column density plotted against the total equivalent hydrogen column density measured from soft X-ray absorption toward Swift GRBs (NHX). While the soft X-ray absorption is presented in units of equivalent hydrogen column density, it is effectively a metal column density converted to equivalent column density assuming AG89 abundances (see text). The best-fit relation is super-solar and is plotted as in Fig. 1 above. The best-fit relation, corresponding to a ratio of , would be even higher using the current Asplund et al. (2009) solar metallicities.
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