Fig. 1.
Column density values of the SBAT4 (blue) and the values of the BAT6ext (red) from Arcodia et al. (2016). Down-pointing arrows represent upper limits for both the populations. Although the numbers of SGRBs is low, the distribution of NH of the events in SBAT4 seems to track that of BAT6ext until z ∼ 1.3, where LGRBs are slightly more absorbed, and some heavily absorbed LGRBs fill the top region of the plot.
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