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Fig. 17

image

Molecular fraction versus neutral atomic-hydrogen column density for the GRB-DLAs from this paper and Ledoux et al. (2009) and Prochaska et al. (2009) compared to QSO-DLAs (Noterdaeme et al. 2008, 2015a; Balashev et al. 2017; Ranjan et al. 2018) and Galactic sight-lines probing diffuse and translucent clouds (Burgh et al. 2010). H2 -bearing DLAs are plotted with colored symbols and the non-detections in gray. For GRB 120327A, 120909A, and 141109A, we plot the molecular fraction for both b = 2 and b = 10 km s−1.

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