All Figures

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg1.eps}\end{figure}$ Figure 1: Color excess E(r-z) in the observer frame calculated for an absorber at redshift $z_{\rm a}$ with rest-frame extinction $A_{\rm V}=1$ mag. The lines correspond to an SMC-type extinction curve (magenta, solid line; Pei 1992; Gordon et al. 2003) and three MW-type extinction curves (red lines; Cardelli et al. 1998) computed at three values of $R \equiv A_{\rm V}/E(B-V)$ (dots: R=2.5; short dashes: R=3.1; long dashes: R=4.0).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg2.eps} \end{figure}$ Figure 2: Mean color ${\langle (r-z)_0 \rangle}$ of the QSOs control samples used to estimate the unreddened colors of the DLA-QSOs. The mean color is plotted versus the QSO redshift, $z_{\rm e}$ . Bright (r < 19.1 mag) and faint ( $r \geq 19.1$ mag) QSOs are plotted with blue crosses and red circles, respectively.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg3a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg3b.eps} \end{figure}$ Figure 3: Frequency distribution of the mean color excess $\langle \Delta(r-z) \rangle$ and $\langle \Delta(g-z) \rangle$ measured in 10 000 bootstrap samples obtained from the list of $\Delta$ values of Table 1. Dotted line: mean color excess of the original sample. See Sect. 4.1.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg4a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg4b.eps} \end{figure}$ Figure 4: Frequency distribution of the mean deviations $\langle \Delta(r-z) \rangle$ and $\langle \Delta(g-z) \rangle$ measured in 10 000 control samples with identical size, redshift distribution and magnitude distribution of the absorption sample. Dotted line: mean color excess of the absorption sample. See Sect. 4.1.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg5a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg5b.eps} \end{figure}$ Figure 5: Deviation from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus r magnitude for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg6a.eps}\hspace*{0.7cm} \includegraphics[width=7.5cm,clip]{8480fg6b.eps} \end{figure}$ Figure 6: Deviations from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus rest-frame equivalent width of Si II line 1526 Å, when detected, for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg7.eps} \end{figure}$ Figure 7: Mean values of rest-frame extinction and metal column density of the two subsets of DLA-QSOs with different strengths of the Si II line 1526 Å shown in Table 4 (absorption sample 2). The extinction values derived from the (g-z) and (r-z) color deviations are plotted with diamonds and circles, respectively. The mean values of metal column density of the two subsets are the same and have been slightly shifted along the horizontal direction for clarity. See Sect. 5.3.
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{8480fg8a.eps}\hspace*{0.4cm}... ...eps}\hspace*{0.4cm} \includegraphics[width=5cm,clip]{8480fg8c.eps} \end{figure}$ Figure 8: Quasars of the absorption sample with color deviations $\Delta (g-z) > 0.4$ mag and strong Si II absorptions at $z_{\rm SiII} = z_{\rm DLA}$ . Dashed line: profile of the 2175 Å extinction bump plotted in a scale $10^{-\xi [ \lambda / (1+z_{\rm DLA}) ]}$ (see Vladilo et al. 2006).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg9a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg9b.eps} \end{figure}$ Figure 9: Deviations from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus H I column density for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{8480fg10a.eps}\hspace*{0.6cm} \includegraphics[width=7.7cm,clip]{8480fg10b.eps} \end{figure}$ Figure 10: Deviations from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus absorption redshift for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg2.eps} \end{figure}$	Figure 2: Mean color ${\langle (r-z)_0 \rangle}$ of the QSOs control samples used to estimate the unreddened colors of the DLA-QSOs. The mean color is plotted versus the QSO redshift, $z_{\rm e}$ . Bright (r < 19.1 mag) and faint ( $r \geq 19.1$ mag) QSOs are plotted with blue crosses and red circles, respectively.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg3a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg3b.eps} \end{figure}$	Figure 3: Frequency distribution of the mean color excess $\langle \Delta(r-z) \rangle$ and $\langle \Delta(g-z) \rangle$ measured in 10 000 bootstrap samples obtained from the list of $\Delta$ values of Table 1. Dotted line: mean color excess of the original sample. See Sect. 4.1.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg4a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg4b.eps} \end{figure}$	Figure 4: Frequency distribution of the mean deviations $\langle \Delta(r-z) \rangle$ and $\langle \Delta(g-z) \rangle$ measured in 10 000 control samples with identical size, redshift distribution and magnitude distribution of the absorption sample. Dotted line: mean color excess of the absorption sample. See Sect. 4.1.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg5a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg5b.eps} \end{figure}$	Figure 5: Deviation from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus r magnitude for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg6a.eps}\hspace*{0.7cm} \includegraphics[width=7.5cm,clip]{8480fg6b.eps} \end{figure}$	Figure 6: Deviations from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus rest-frame equivalent width of Si II line 1526 Å, when detected, for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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$\begin{figure} \par\includegraphics[width=5cm,clip]{8480fg8a.eps}\hspace{0.4cm}... ...eps}\hspace{0.4cm} \includegraphics[width=5cm,clip]{8480fg8c.eps} \end{figure}$	Figure 8: Quasars of the absorption sample with color deviations $\Delta (g-z) > 0.4$ mag and strong Si II absorptions at $z_{\rm SiII} = z_{\rm DLA}$ . Dashed line: profile of the 2175 Å extinction bump plotted in a scale $10^{-\xi [ \lambda / (1+z_{\rm DLA}) ]}$ (see Vladilo et al. 2006).
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{8480fg9a.eps}\hspace*{0.8cm} \includegraphics[width=7.5cm,clip]{8480fg9b.eps} \end{figure}$	Figure 9: Deviations from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus H I column density for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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$\begin{figure} \par\includegraphics[width=7.7cm,clip]{8480fg10a.eps}\hspace*{0.6cm} \includegraphics[width=7.7cm,clip]{8480fg10b.eps} \end{figure}$	Figure 10: Deviations from the mean color, $\Delta (r-z)$ and $\Delta (g-z)$ , versus absorption redshift for sample 2 of Table 3. Dotted lines: mean color excess of the same sample.
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