All Figures

$\begin{figure} \par\includegraphics[width=65mm,clip]{1738fig1.eps}\end{figure}$ Figure 1: a) Distribution of the data in the s-z parameter plane and b) in the s- $\lambda$ plane. Crosses are for objects in the low-z sample and circles for the high-zsample (filled circles indicate objects in the "high-contrast'' subsample). In b) the number of points is smaller than in a), because in b) a single mark may indicate more than one absorption system.
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In the text

$\begin{figure} \par\includegraphics[width=84mm,clip]{1738fig2.eps}\end{figure}$ Figure 2: Dependence on the spread in the relative optical depths s of the $\Delta \alpha /\alpha$ values, for the high-z sample. The dot-dashed line divides the figure in two parts: for s<0.8 no trend of $\Delta \alpha /\alpha$ with s is apparent; for s>0.8, instead, values of $\Delta \alpha /\alpha$ decrease for increasing s. As in Fig. 1, filled circles indicate the "high-contrast'' subsample.
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In the text

$\begin{figure} \par\includegraphics[width=65mm,clip]{1738fig3.eps}\end{figure}$ Figure 3: Correlations between $\Delta \alpha /\alpha$ and $\lambda$ for high-contrast (high-z) objects, a) $N(\hbox{H~{\sc i}~})>3\times10^{20}{~\rm {cm^{-2}}}$ , b) $N(\hbox{H~{\sc i}~})\le3\times10^{20}{~\rm {cm^{-2}}}$ .
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In the text

$\begin{figure} \par\includegraphics[width=75mm]{1738fig4.eps}\end{figure}$ Figure 4: GRS in $\rm {km~s^{-1}}$ as a function of the galactocentric distance x=R/R₂₀₀ at z=2. The 3 sets of curves correspond to the halo masses $M_{200}h=10^{11},10^{12},2\times 10^{12}\ M_{\odot }$ . The continuous lines are for concentration values C=2, the dashed lines for C=6, the dash-dotted lines for C=10.
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In the text

$\begin{figure} \par\includegraphics[width=75mm]{1738fig5.eps}\end{figure}$ Figure 5: Relative change of $V_{{\rm grav}}$ and $V_{{\rm orb,r}}$ , along the line of sight, for different values of the impact parameter d.
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In the text

$\begin{figure} \par\includegraphics[width=65mm,clip]{1738fig1.eps}\end{figure}$	Figure 1: a) Distribution of the data in the s-z parameter plane and b) in the s- $\lambda$ plane. Crosses are for objects in the low-z sample and circles for the high-zsample (filled circles indicate objects in the "high-contrast'' subsample). In b) the number of points is smaller than in a), because in b) a single mark may indicate more than one absorption system.
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$\begin{figure} \par\includegraphics[width=65mm,clip]{1738fig3.eps}\end{figure}$	Figure 3: Correlations between $\Delta \alpha /\alpha$ and $\lambda$ for high-contrast (high-z) objects, a) $N(\hbox{H~{\sc i}~})>3\times10^{20}{~\rm {cm^{-2}}}$ , b) $N(\hbox{H~{\sc i}~})\le3\times10^{20}{~\rm {cm^{-2}}}$ .
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$\begin{figure} \par\includegraphics[width=75mm]{1738fig4.eps}\end{figure}$	Figure 4: GRS in $\rm {km~s^{-1}}$ as a function of the galactocentric distance x=R/R₂₀₀ at z=2. The 3 sets of curves correspond to the halo masses $M_{200}h=10^{11},10^{12},2\times 10^{12}\ M_{\odot }$ . The continuous lines are for concentration values C=2, the dashed lines for C=6, the dash-dotted lines for C=10.
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$\begin{figure} \par\includegraphics[width=75mm]{1738fig5.eps}\end{figure}$	Figure 5: Relative change of $V_{{\rm grav}}$ and $V_{{\rm orb,r}}$ , along the line of sight, for different values of the impact parameter d.
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