Molecular hydrogen fraction (f(H2)) against NHI along the lines of sight for data cubes with densities 1 cm-3 (blue solid triangles) and 3 cm-3 (red solid circles). Column density of H2, detected in GRB afterglow spectra for five GRBs (GRB 060206, Fynbo et al. 2006; GRB 080607, Prochaska et al. 2009; GRB 120327A, D’Elia et al. 2014; GRB 120815A, Krühler et al. 2013; GRB 121014A, Friis et al. 2015) are indicated in green and six GRBs with upper limits on f(H2) are indicated in black (Tumlinson et al. 2007; Ledoux et al. 2009). Projected NHI for the f(H2) for data cubes with densities 1 cm-3 (blue open triangles) and 3 cm-3 (red open circles).
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