Metal absorption lines from [O]{}[i]{} $\lambda$ 1302, [Fe]{}[ii]{} $\lambda\lambda\lambda\lambda\lambda$ 1608, 1611, 2344, 2374, 2382, [Si]{}[ii]{} $\lambda\lambda$ 1526, 1808, [Al]{}[iii]{} $\lambda\lambda$ 1854, 1862, [Si]{}[iv]{} $\lambda\lambda$ 1393, 1402, and [C]{}[iv]{} $\lambda\lambda$ 1548, 1550 associated with the sub-DLA are covered in the red part of the spectrum. Fig. \[1232+0815\] shows the best fit result of [H]{}[i]{} column density of the sub-DLA. While the Ly$\alpha$ line is noisy, the presence of the sub-DLA is confirmed through the metal lines detected in the spectrum (see Fig. \[met1232\]).

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12. QSO J1330-2522 ($z_{\rm em}=3.910$). Two sub-DLAs were previously reported at $z_{\rm abs}=2.910$ and 3.080 [@peroux01] along the line-of-sight of this quasar. A Lyman limit system at $z_{\rm LLS}=3.728$ is also seen. We report a new sub-DLA at $z_{\rm abs}=2.654$ with neutral hydrogen column density of log $N_{{\rm H}\,{\sc \rm I}}=19.56\pm0.13$ and $b=25.5\pm2.4$ km s$^{-1}$. Fig. \[J1330-2522\] shows our best fit result. Metal lines from [Si]{}[ii]{} $\lambda\lambda\lambda$ 1260, 1526, 1808, [Al]{}[ii]{} $\lambda$ 1670, [Al]{}[iii]{} $\lambda\lambda$ 1854, 1862, [Si]{}[iv]{} $\lambda\lambda$ 1393, 1402, and [C]{}[iv]{} $\lambda\lambda$ 1548, 1550 are covered in the red part of the spectrum at the redshift of the sub-DLA. As an example of metal lines, low ionization lines from the sub-DLA confirming its presence 