Normalized and reversed cumulative distribution of the host intrinsic dust extinction derived for the GRBs with redshift z> 4 from this work, compared to the BAT6 sample (Covino et al. 2013) and GROND 4h sample (Greiner et al. 2011), which are both unbiased samples. We also plot the data from Zafar et al. (2011a); this plot is based on the GRB sample from Fynbo et al. (2009) and likely biased toward low extinction sightlines.
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