All Figures

$\begin{figure} \par\includegraphics[angle=270,width=8.5cm,clip]{1030fig1.ps} \end{figure}$ Figure 1: Four examples of C IV systems in our sample. The dashed lines correspond to fits using the old wavelength ratio. The separation of the two modelled lines ( $\lambda$ 1548 is the bottom line and $\lambda$ 1550 the upper line), using published wavelengths, is too large. The solid lines correspond to the best value obtained from the full sample.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1030fig2.ps} \end{figure}$ Figure 2: The fitted parameter c defined as $\lambda _2$ / $\lambda _1 =(\lambda _2$ / $\lambda _1)_0\times (1+c$ ), where the "0'' subscript indicates published values, is plotted versus an arbitrary ranking scale for the 106 C IV (lower panel) and 28 Si IV (upper panel) doublets. Systems are ordered by increasing redshift. The histograms show the distribution of c values. The weighted means of c are ( $- 2.23\pm 0.04)\times 10^{-6}$ and ( $0.18\pm 0.09)\times 10^{-6}$ for, respectively, C IV and Si IV. The means and 3 $\sigma$ limits are indicated by solid and dashed lines respectively. Five additional measurements using the publicly available Keck spectrum of APM 08279+5255 are overplotted as filled circles and are consistent with the UVES measurements.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{1030fig3.ps} \end{figure}$ Figure 3: Histogram of the wavelength shift to be applied to the published wavelength of C IV $\lambda$ 1548. We find $\Delta \lambda =0.90$ mÅ and $\sigma =0.6$ mÅ.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{1030fig4.ps} \end{figure}$ Figure 4: The Doppler parameter of C IV components is shown versus the Doppler parameter of Si IV corresponding components as measured in the fits of the 11 C IV-Si IV systems. Most of the points lie between the curves ( $b_{\rm CIV} = b_{\rm SiIV}$ ) expected for turbulent broadening and ( $b_{\rm CIV} = \sqrt {m_{\rm SiIV}/m_{\rm CIV}} b_{\rm SiIV}$ ) expected for thermal broadening.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.5cm,clip]{1030fig1.ps} \end{figure}$	Figure 1: Four examples of C IV systems in our sample. The dashed lines correspond to fits using the old wavelength ratio. The separation of the two modelled lines ( $\lambda$ 1548 is the bottom line and $\lambda$ 1550 the upper line), using published wavelengths, is too large. The solid lines correspond to the best value obtained from the full sample.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{1030fig3.ps} \end{figure}$	Figure 3: Histogram of the wavelength shift to be applied to the published wavelength of C IV $\lambda$ 1548. We find $\Delta \lambda =0.90$ mÅ and $\sigma =0.6$ mÅ.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{1030fig4.ps} \end{figure}$	Figure 4: The Doppler parameter of C IV components is shown versus the Doppler parameter of Si IV corresponding components as measured in the fits of the 11 C IV-Si IV systems. Most of the points lie between the curves ( $b_{\rm CIV} = b_{\rm SiIV}$ ) expected for turbulent broadening and ( $b_{\rm CIV} = \sqrt {m_{\rm SiIV}/m_{\rm CIV}} b_{\rm SiIV}$ ) expected for thermal broadening.
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