Fig. 10
H i column density distribution for DLAs and sub-DLAs detected by Noterdaeme et al. (2009) in quasars observed both by SDSS-DR7 and BOSS (black histogram). The red histogram displays the same distribution but for DLAs flagged after visual inspection of BOSS spectra. This shows that the visual inspection is robust for log N(H i) > 20.3, the standard definition of DLAs.
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