All Figures

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6405fig1.ps} \end{figure}$ Figure 1: The normalized OA spectra centred on the Ly $\alpha$ absorption lines at the GRB host galaxy redshifts. A neutral hydrogen column density fit to the damped Ly $\alpha$ line is shown with a solid line in each panel, while the 1 $\sigma$ errors are shown with dashed lines.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{6405fig2.ps} \end{figure}$ Figure 2: The two-dimensional GRB 060714 OA spectrum centred on the Ly $\alpha$ absorption line. Ly $\alpha$ in emission is clearly extended and centred in the trough.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{6405fig3.eps} \end{figure}$ Figure 3: Bottom: histogram of the H I column density measured in GRBs for which the redshift was large enough to detect Ly $\alpha$ . Bursts detected by Swift are filled while the pre-Swift sample is hashed (Vreeswijk et al. 2004). The current range of known GRB H I systems is $19.2 \leq \log N(H {\sc i}) \leq 22.7$ . For comparison, the QSO-DLAs (Prochaska et al. 2005) are overplotted as the dashed histogram (normalized with respect to the GRB observations). The solid, non-filled histogram shows the GRB N(H I) prediction by RP02. Top: the corresponding afterglow R-band magnitudes, corrected for Galactic extinction (Schlegel et al. 1998), interpolated to a common epoch of 12 hr (in the source restframe) and redshifted to z = 3. GRBs 060210 and 060522 are omitted due to the lack of information on their spectral energy distribution; hence corrections could not be made to account for Ly $\alpha$ absorption. Where the uncertainty on the H I column is not reported in the literature, a value of 0.2 has been plotted.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6405fig1.ps} \end{figure}$	Figure 1: The normalized OA spectra centred on the Ly $\alpha$ absorption lines at the GRB host galaxy redshifts. A neutral hydrogen column density fit to the damped Ly $\alpha$ line is shown with a solid line in each panel, while the 1 $\sigma$ errors are shown with dashed lines.
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{6405fig2.ps} \end{figure}$	Figure 2: The two-dimensional GRB 060714 OA spectrum centred on the Ly $\alpha$ absorption line. Ly $\alpha$ in emission is clearly extended and centred in the trough.
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