$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7726fig1.eps}\end{figure}$ Figure 1: The time dependence of v (solid line), $C_{{\rm A}s}$ (dashed line), and $C_{{\rm A} \varphi }$ (dashed-and-dotted line) for q=0.1, x= 3, $\beta _s=0.01$ , and $\beta _{\varphi }=1$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7726fig3.eps}\end{figure}$ Figure 3: Same as in Fig. 2 but for q=-0.01, $\beta _s = \beta _{\varphi } = 0.1$ , and x=10. The initial conditions are as for in Fig. 1.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7726fig5.eps}\end{figure}$ Figure 5: The long-term behaviour of the amplitude of v for $\beta _s = \beta _{\varphi } = 0.1$ , q=2, and x=3.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7726fig1.eps}\end{figure}$	Figure 1: The time dependence of v (solid line), $C_{{\rm A}s}$ (dashed line), and $C_{{\rm A} \varphi }$ (dashed-and-dotted line) for q=0.1, x= 3, $\beta _s=0.01$ , and $\beta _{\varphi }=1$ .
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7726fig2.eps}\end{figure}$	Figure 2: Same as in Fig. 1 but for q= -0.1 and x=10.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7726fig3.eps}\end{figure}$	Figure 3: Same as in Fig. 2 but for q=-0.01, $\beta _s = \beta _{\varphi } = 0.1$ , and x=10. The initial conditions are as for in Fig. 1.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{7726fig4.eps}\end{figure}$	Figure 4: Same as in Fig. 1 but for q=1 and $\beta _s = \beta _{\varphi } = 0.1$ .
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7726fig5.eps}\end{figure}$	Figure 5: The long-term behaviour of the amplitude of v for $\beta _s = \beta _{\varphi } = 0.1$ , q=2, and x=3.
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