$\begin{figure} \par\resizebox{4.1cm}{!}{\includegraphics{2398P_1h.ps}}\hspace*{2... ...}}\hspace*{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4h.ps}} \end{figure}$ Figure 7: Cumulative line intensities of [SI] 25.2 (solid), [OI] 63.2 (dotted), 145.6 (dashed), [FeII] 26.0 (dot-dashed) and 35.4 $\mu$ m (dotted-dashed), for PDR ( left) and XDR ( right) models.
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In the text

$\begin{figure} \par\mbox{\resizebox{7.5cm}{!}{\includegraphics{2398X_1d.ps}}\hsp... ...ce*{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4d.ps}} } \par \end{figure}$	Figure 1: Important heating processes for Model 1 ( top left), 2 ( top right), 3 ( bottom left) and 4 ( bottom right).
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$\begin{figure} \par\resizebox{7.5cm}{!}{\includegraphics{2398X_1c.ps}}\hspace{... ...pace{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4c.ps}}\par \end{figure}$	Figure 2: Important cooling processes for Model 1 ( top left), 2 ( top right), 3 ( bottom left) and 4 ( bottom right).
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{2398X_1a.ps}\hspace{2mm} ... ...3a.ps}\hspace{2mm} \includegraphics[width=7.5cm,clip]{2398X_4a.ps} \end{figure}$	Figure 3: Fractional abundances and temperature for Model 1 ( top left), 2 ( top right), 3 ( bottom left) and 4 ( bottom right).
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$\begin{figure} \resizebox{7.5cm}{!}{\includegraphics{2398X_1b.ps}}\hspace{2mm} ... ...space{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4b.ps}}\par \end{figure}$	Figure 4: Fractional abundances for model 1 ( top left), 2 ( top right), 3 ( bottom left) and 4 ( bottom right).
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$\begin{figure} \par\resizebox{4.1cm}{!}{\includegraphics{2398P_s1.ps}}\hspace{2... ...}}\hspace{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_s4.ps}} \end{figure}$	Figure 5: Comparison between the fractional abundances in the PDR ( left) and XDR ( right) for Model 4.
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$\begin{figure} \par\resizebox{4.2cm}{!}{\includegraphics{2398P_1g.ps}}\hspace{3... ...}}\hspace{3mm} \resizebox{7.4cm}{!}{\includegraphics{2398X_4g.ps}} \end{figure}$	Figure 6: Cumulative line intensities of [CII] 158 (solid), [SiII] 34.8 (dotted), [CI] 609 (dashed) and 369 $\mu$ m (dashed), for PDR ( left) and XDR ( right) models.
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$\begin{figure} \par\resizebox{4.1cm}{!}{\includegraphics{2398P_1h.ps}}\hspace{2... ...}}\hspace{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4h.ps}} \end{figure}$	Figure 7: Cumulative line intensities of [SI] 25.2 (solid), [OI] 63.2 (dotted), 145.6 (dashed), [FeII] 26.0 (dot-dashed) and 35.4 $\mu$ m (dotted-dashed), for PDR ( left) and XDR ( right) models.
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$\begin{figure} \par\resizebox{4.1cm}{!}{\includegraphics{2398P_1e.ps}}\hspace{2... ...}}\hspace{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4e.ps}} \end{figure}$	Figure 8: Cumulative column densities of C (dotted-dashed), CO (solid), C₂H (dotted), H₂O (dashed) and OH (dot-dashed), for PDR ( left) and XDR ( right) models.
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$\begin{figure} \par\resizebox{4.1cm}{!}{\includegraphics{2398P_1f.ps}}\hspace{2... ...}}\hspace{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4f.ps}} \end{figure}$	Figure 9: Cumulative column densities of CS (solid), HCN (dotted), HCO⁺ (dashed), HNC (dot-dashed) and SiO (dotted-dashed), for PDR ( left) and XDR ( right) models.
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$\begin{figure} \par\resizebox{4.1cm}{!}{\includegraphics{2398P_1k.ps}}\hspace{2... ...}}\hspace{2mm} \resizebox{7.5cm}{!}{\includegraphics{2398X_4k.ps}} \end{figure}$	Figure 10: Column density ratios CO/C (solid), CO/H₂ (dotted), HCO⁺/HCN (dashed) and HNC/HCN (dot-dashed), for PDR ( left) and XDR ( right) models.
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