Table 1: List of the observed DLA and sub-DLA systems with column densities and metallicities taken from the literature.
Coordinate name Alt. name $z_{{\rm em}}$ $z_{{\rm abs}}$ $\log$ $N(H {\sc i})$ [Fe/H] [Si/H] Ref.
Q0151+048A PHL 1222 1.93 1.934 20.36 $\pm $ 0.10     (1)
Q0953+4749 PC 0953+4749 4.457 3.404 21.15 $\pm $ 0.15 >-2.178 >-2.09 (2, 3)
      3.891 21.20 $\pm $ 0.10 >-1.712 >-1.60  
      4.244 20.90 $\pm $ 0.15 -2.50 $\pm $ 0.17 -2.23 $\pm $ 0.15  
Q1347+112   2.679 2.471 20.3     (4, 5, 6)
      2.05 20.3$^\dagger$     (7)
Q1425+606 SBS 1425+606 3.163 2.827 20.30 $\pm $ 0.04 -1.33 $\pm $ 0.04 >-1.03 (8, 9, 10, 21)
Q1451+1223 B1451+123 3.246 2.469 20.39 $\pm $ 0.10 -2.54 $\pm $ 0.12 -1.95 $\pm $ 0.16 (11, 24)
      3.171 19.70 $\pm $ 0.15 -1.87 $\pm $ 0.16 -1.62 $\pm $ 0.15 (19)
      2.254 20.30 $\pm $ 0.15 -1.47 $\pm $ 0.17 >-0.40 (6, 12, 19)
Q1759+7539 GB2 1759+756 3.05 2.625 20.76 $\pm $ 0.10 -1.21 $\pm $ 0.10 -0.82 $\pm $ 0.10 (13, 18, 20)
      2.91 19.8 -1.65 $\pm $ 0.01 -1.26 $\pm $ 0.01 (18)
Q1802+5616 PSS J1802+5616 4.158 3.391 20.30 $\pm $ 0.10 -1.54 $\pm $ 0.11 >-1.55 (23)
      3.554 20.50 $\pm $ 0.10 -1.93 $\pm $ 0.12 >-1.82  
      3.762 20.55 $\pm $ 0.15 -1.82 $\pm $ 0.26 >-1.74  
      3.811 20.35 $\pm $ 0.20 -2.19 $\pm $ 0.23 -2.04 $\pm $ 0.22  
Q2155+1358 PSS J2155+1358 4.256 3.316 20.55 $\pm $ 0.15 >-1.68 -1.26 $\pm $ 0.17 (3)
      3.142 19.94 $\pm $ 0.10 -2.21 $\pm $ 0.21 -1.85 $\pm $ 0.12 (14, 19)
      3.565 19.37 $\pm $ 0.15 <-2.40 -1.27 $\pm $ 0.16 (14, 19)
      4.212 19.61 $\pm $ 0.15 -2.18 $\pm $ 0.25 -1.92 $\pm $ 0.11 (14, 19)
Q2233+131   3.295 3.153 20.0 >-1.4 $\pm $ 0.1 >-1.04 (15, 16, 17)
      2.551 20.0     (12,16)
$^\dagger$ Denotes a system where the reported $N(H {\sc i})$ needs to be confirmed through high resolution spectroscopy. References for either DLA redshifts or metallicities: (1) Møller et al. (1998); (2) Schneider et al. (1991); (3) Prochaska et al. (2003d); (4) Smith et al. (1986); (5) Wolfe et al. (1986); (6) Turnshek et al. (1989); (7) Wolfe et al. (1995); (8) Chaffee et al. (1994); (9) Stepanian et al. (1996); (10) Prochaska et al. (2002a); (11) Bechtold (1994); (12) Lanzetta et al. (1991); (13) Prochaska et al. (2001); (14) Péroux et al. (2003); (15) Steidel et al. (1995); (16) Lu et al. (1997); (17) Prochaska et al. (2003a); (18) Outram et al. (1999); (19) Dessauges-Zavadsky et al. (2003); (20) Prochaska et al. (2002b); (21) Lu et al. (1996); (22) Prochaska et al. (2003c); (23) Prochaska et al. (2003b); (24) Petitjean et al. (2000).

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