are plotted in Fig. \[met1330\]. High ionization lines are blended with the lines from the other two sub-DLAs.

13. QSO J1356-1101 ($z_{\rm em}=3.006$). Two damped absorbers have been previously reported in this quasar at $z_{\rm abs}=2.501$ and 2.967 [@prochaska07; @noterdaeme08; @fox09]. We report for the first time a sub-DLA at $z_{\rm abs}=2.397$ in the quasar. From the $\ion{O}{i}$, we find four strong components in the system at 29, 0, -48, and -300 km s$^{-1}$. The total $\ion{H}{i}$ column density of the system is log $N_{{\rm H}\,{\sc \rm I}}=19.88\pm0.09$ with $b=20$, 20, 20, (fixed) $28\pm2.8$ km s$^{-1}$ for 29, 0, -48, and -300 km s$^{-1}$ components respectively. The component at 0 km s$^{-1}$ is strongest and heavily dominates over other components. Metal absorption lines from [O]{}[i]{} $\lambda$ 1302, [Fe]{}[ii]{} $\lambda\lambda\lambda\lambda\lambda$ 1144, 2344, 2374, 2382, 2586, and [Si]{}[ii]{} $\lambda\lambda\lambda$ 1190, 1193, 1260, 1304 associated with the sub-DLA are detected in the red part of the spectrum. Fig. \[J1356-1101\] shows the best fit result of the neutral hydrogen column density of the sub-DLA.

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14. QSO J1723+2243 ($z_{\rm em}=4.520$). A damped absorber has been previously reported in this quasar at $z_{\rm abs}=3.697$ [@prochaska07; @guimares09]. We observed a sub-DLA down to Ly$\gamma$ at 