was discovered during the course of the 2dF quasar redshift survey [@croom01]. An [H]{}[i]{} absorber at $z=2.253$ is reported by @tytler09. We find that the absorber is a sub-DLA with log $N_{{\rm H}\,{\sc \rm I}}=20.22\pm0.10$ and $b=28.5\pm2.2$ km s$^{-1}$ at $z_{\rm abs}=2.254$. The Lyman series lines down to Ly$\beta$ are fitted together. In the red part of the spectrum metal lines from [O]{}[i]{} $\lambda$ 1302, [Fe]{}[ii]{} $\lambda\lambda\lambda\lambda$ 2344, 2374, 2382, 2586, [Si]{}[ii]{} $\lambda\lambda\lambda\lambda$ 1260, 1304, 1526, 1808, [C]{}[ii]{} $\lambda$ 1334, [Mg]{}[ii]{} $\lambda\lambda$ 2796, 2803, [Al]{}[iii]{} $\lambda\lambda$ 1854, 1862, and [Si]{}[iv]{} $\lambda\lambda$ 1393, 1402 are detected at the redshift of the sub-DLA. Fig. \[J0008-2900\] shows our best fit result of the [H]{}[i]{} lines.

2.  QSO J0008-2901 ($z_{\rm em}=2.607$). The quasar was also discovered during the course of the 2dF quasar redshift survey [@croom01]. An [H]{}[i]{} absorber at $z=2.491$ is reported by @tytler09. We find that the absorber at $z_{\rm abs}=2.491$ is a sub-DLA with log $N_{{\rm H}\,{\sc \rm I}}=19.94\pm0.11$ and $b=39\pm3.5$ km s$^{-1}$ detected down to Ly$\gamma$. Metal lines from [O]{}[i]{} $\lambda$ 1302, [Fe]{}[ii]{} $\lambda\lambda\lambda\lambda$ 2344, 2374, 2382, 2586, [Si]{}[ii]{} $\lambda\lambda\lambda$ 1260, 1304, 1808, [C]{}[ii]{} $\lambda$ 1334, [Al]{}[ii]{} $\lambda$ 1670, and [Si]{}[iv]{} $\lambda\lambda$ 1393, 1402 are detected in the red part 