Table 2: The redshift, neutral hydrogen column density and absorption lines identified for each afterglow spectrum. The number in square brackets after the redshift indicates the number of lines used to calculate it.
GRB  z $\log N(H {\sc i})$ Absorption features
050319 $3.240 \pm 0.001$ [3] $20.90 \pm 0.20$ Ly$\alpha $, Si II 1260, O I 1302, C II 1334/C II* 1335, C IV 1548,1550
050922C $2.198 \pm 0.002$ [8] $21.55 \pm 0.10$ Ly$\alpha $, Si II 1260, Si II* 1264, O I 1302/Si II 1304, C II 1334/C II* 1335, Si IV 1393,1402,
      Si II 1526, Si II* 1533, C IV 1548,1550, Fe II 1608, Al II 1670
060526 $3.221 \pm 0.001$ [12] $20.00 \pm 0.15$ Si II 1190,1193, Si III 1206, Ly$\alpha $, Si II 1260, O I 1302, Si II 1304, C II 1334,
      C II* 1335, Si II 1526, Si II* 1533, Fe II 1608, Al II 1670
060707 $3.425 \pm 0.002$ [8] $21.00 \pm 0.20$ Ly$\beta$, C II 1036/C II* 1037, N II 1083, Si III 1206, Ly$\alpha $, Si II 1260, O I 1302/Si II 1304,
      C II 1334/C II* 1335, Si II 1526, C IV 1548,1550, Al II 1670
060714 $2.711 \pm 0.001$ [36] $21.80 \pm 0.10$ Ly$\gamma$, C III 977, Si II 989, Ly$\beta$, O VI 1031,1037, C II 1036, C II* 1037, N II 1083, Fe II 1144,
      Si II 1190,1193, Ly$\alpha $, S II 1250,1253, Si II 1260, Si II* 1264, O I 1302/Si II 1304, Si II* 1309,
      C II 1334/C II* 1335, Ni II 1317,1370, Si IV 1393,1402, Si II 1526, Si II* 1533, C IV 1548,1550,
      Fe II 1608, Al II 1670, Ni II 1709,1741, Si II 1808, Al III 1854,1862, Zn II 2026,2062,
      Fe II 2260,2344,2374,2382, Fe II** 2328,2349, Fe II*** 2359, Fe II* 2365
060906 $3.686 \pm 0.002$ [5] $21.85 \pm 0.10$ Ly$\beta$, C II 1036/C II* 1037, Ly$\alpha $, Si II 1260, O I 1302/Si II 1304,
      C II 1334/C II* 1335, Si IV 1393,1402, Si II 1526


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