Column densities of CO (top), H2 (middle) and overall molecular fractions (bottom) vs N(C I). CO detections are represented by red colours. The N(C I)-distributions and median logN(CO) values (horizontal lines) are shown for the statistical sample only (circles). Squares correspond to high-z H2 DLA systems from the literature (Balashev et al. 2010, 2011, 2017; Carswell et al. 2011; Guimarães et al. 2012; Noterdaeme et al. 2015, 2017; Petitjean et al. 2002).
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