$\begin{figure} \par\includegraphics[angle=270,width=8.8cm]{f1_col.ps}\par\vspace*{4mm} \par\includegraphics[angle=270,width=8.8cm]{f2_col.ps}\end{figure}$ Figure 1: Diffusion maps showing the stability properties of the resonance in the $[e^f_{\rm b}, e^f_{\rm c}]$ plane. In the upper plot planet e is included in the system while in the lower plot only planets b,c and a are considered. Different gray levels represent values of $\sigma$ ranging from 1 to 3. Filled circles mark the systems that are in apsidal libration. The empty circle represents the nominal planetary system.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.8cm]{f3_col.ps}\par\vspace*{4mm} \par\includegraphics[angle=270,width=8.8cm]{f4_col.ps}\end{figure}$ Figure 2: Diffusion maps in the $[e^f_{\rm b}, D]$ plane. As in Fig. 1, the upper plot is for dynamical systems with planet e included while the lower plot does not include planet e. Symbols are as in Fig. 1.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8cm]{f5.ps}\end{figure}$ Figure 3: Center of libration $\theta _M$ as a function of the corresponding libration amplitude D of the critical angle of the 3/1 resonance.
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In the text

$\begin{figure} \par {\includegraphics[angle=270,width=8.4cm]{f6.ps} } \end{figure}$ Figure 4: Evolution with time of the critical angle of the 3/1 resonance for two different cases in our sample.
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In the text

$\begin{figure} \par {\includegraphics[angle=270,width=8.8cm]{f7_col.ps} } \par\vspace*{4mm} \par {\includegraphics[angle=270,width=8.8cm]{f8_col.ps} } \end{figure}$ Figure 5: Migration tracks for planets b and c prior (dashed line) and after (solid line) capture in resonance. The tracks are superimposed on the diffusion map of Figs. 1 and 2, lower plots.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=8.8cm]{f3_col.ps}\par\vspace*{4mm} \par\includegraphics[angle=270,width=8.8cm]{f4_col.ps}\end{figure}$	Figure 2: Diffusion maps in the $[e^f_{\rm b}, D]$ plane. As in Fig. 1, the upper plot is for dynamical systems with planet e included while the lower plot does not include planet e. Symbols are as in Fig. 1.
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$\begin{figure} \par\includegraphics[angle=270,width=8cm]{f5.ps}\end{figure}$	Figure 3: Center of libration $\theta _M$ as a function of the corresponding libration amplitude D of the critical angle of the 3/1 resonance.
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$\begin{figure} \par {\includegraphics[angle=270,width=8.4cm]{f6.ps} } \end{figure}$	Figure 4: Evolution with time of the critical angle of the 3/1 resonance for two different cases in our sample.
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$\begin{figure} \par {\includegraphics[angle=270,width=8.8cm]{f7_col.ps} } \par\vspace*{4mm} \par {\includegraphics[angle=270,width=8.8cm]{f8_col.ps} } \end{figure}$	Figure 5: Migration tracks for planets b and c prior (dashed line) and after (solid line) capture in resonance. The tracks are superimposed on the diffusion map of Figs. 1 and 2, lower plots.
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