Table 5: Mean metallicity and extinction per unit metal column density for the DLA-QSOs with Si II measurements.
Color     (r-z)       (g-z)  
Absorption n ${\langle {\rm [M/H]} \rangle}^b$ ${\langle {\rm [M/H]} \rangle}_w^c$ $\langle s_{\rm V}^{\rm Fe} \rangle^d$ n ${\langle {\rm [M/H]} \rangle}^b$ ${\langle {\rm [M/H]} \rangle}_w^c$ $\langle s_{\rm V}^{\rm Fe} \rangle^d$
samplea       [10-17 mag cm2]       [10-17 mag cm2]
1 180 $-1.19 \pm 0.03$ -1.07 14 $\pm$ 8 171 $-1.18 \pm 0.03$ -1.07 7.5 $\pm$ 4.3
2 179 $-1.18 \pm 0.03$ -1.07 12 $\pm$ 8 170 $-1.18 \pm 0.03$ -1.06 5.8 $\pm$ 4.0
3 178 $-1.18 \pm 0.03$ -1.07 11 $\pm$ 8 169 $-1.17 \pm 0.03$ -1.06 5.4 $\pm$ 4.0
a Absorption samples are defined in Table 3. Only cases with Si II line detected at more than 1$\sigma$ level are considered in this table.
b Mean metallicity $\langle {\rm [M/H]} \rangle \equiv \log ~ \langle 10^{\rm [M/H]}\rangle$. The quoted error is the standard error of the mean.
c Mean H I column-density weighted metallicity of Eq. (9).
d Mean extinction per unit dust column density of iron (Sect. 5.5). The quoted error is the standard error of the mean.

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