1 INTRODUCTION

2 THE XQ-100 SAMPLE

3 LITERATURE SAMPLES
3.1 The Peroux et al. (2003) compilation
3.2 The Prochaska & Wolfe (2009) SDSS DLA sample
3.3 The Guimaraes et al. (2009) sample
3.4 The Crighton et al. (2015) sample
3.5 The combined sample

4 ANALYSIS
4.1 Redshift path coverage
4.2 DLA distribution function
4.3 Hydrogen mass density (Ω_HI) curves
4.4 DLA incidence rate

5 DISCUSSION

6 CONCLUSIONS