$\begin{figure} \par\includegraphics[width=8.5cm,clip]{9432fig1.eps}\end{figure}$ Figure 1: Temporal evolution of the maximum normalised number density for $\lambda = 100\pi$ with different wave amplitudes: A = 1.5 (solid), 1.0 (dashed) and 0.7 (dotted). The normalisation factor is $n_{\rm H} = 10^3$ cm^-3.
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In the text

$\begin{figure} \resizebox{8.8cm}{!}{\includegraphics{9432fig2}}\end{figure}$ Figure 2: Density structure for $\lambda = 100\pi$ with wave amplitude A₁ = 1.5 after 4 wave periods. The contour lines indicate normalised number densities higher than 5, 10, 15 and 20. The same normalisation factor as in Fig. 1 is used.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{9432fig4}\par\includegraphics[width=8.5cm,clip]{9432fig5}\end{figure}$ Figure 4: The normalised density structure at half a wave period for $\lambda = 100\pi$ ( upper panel) and $\lambda = 10\pi$ ( lower panel) with A=1.5. The density range is set between 1 and 4 with the same normalisation factor as in Fig. 1.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{9432fig1.eps}\end{figure}$	Figure 1: Temporal evolution of the maximum normalised number density for $\lambda = 100\pi$ with different wave amplitudes: A = 1.5 (solid), 1.0 (dashed) and 0.7 (dotted). The normalisation factor is $n_{\rm H} = 10^3$ cm^-3.
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$\begin{figure} \resizebox{8.8cm}{!}{\includegraphics{9432fig2}}\end{figure}$	Figure 2: Density structure for $\lambda = 100\pi$ with wave amplitude A₁ = 1.5 after 4 wave periods. The contour lines indicate normalised number densities higher than 5, 10, 15 and 20. The same normalisation factor as in Fig. 1 is used.
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$\begin{figure} \includegraphics[width=8.5cm,clip]{9432fig3}\end{figure}$	Figure 3: Same as Fig. 1 but for $\lambda = 10\pi$ .
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{9432fig4}\par\includegraphics[width=8.5cm,clip]{9432fig5}\end{figure}$	Figure 4: The normalised density structure at half a wave period for $\lambda = 100\pi$ ( upper panel) and $\lambda = 10\pi$ ( lower panel) with A=1.5. The density range is set between 1 and 4 with the same normalisation factor as in Fig. 1.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{9432fig6}\end{figure}$	Figure 5: The normalised density structure after 3 wave periods for $\lambda = \pi$ with A=1.5.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{9432fig7}\end{figure}$	Figure 6: Same as Fig. 1 but for $\lambda = \pi$ .
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