All Figures

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3358fig1.eps} \end{figure}$ Figure 1: Spectra of M 83 at the central and two spiral arm positions (Table 2). Offsets are given in arcseconds relative to the (0, 0) position (Table 1). Velocities are relative to LSR. All spectra are on the $T_{\rm mb}$ scale. The ¹²CO data are at a common resolution of 80''. The [C I] and ¹³CO data are at their original resolutions listed in Table 2.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{3358fig2.eps} \end{figure}$ Figure 2: Spectra of M 51 at the central and two spiral arm positions (cf. Fig. 1).
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In the text

$\begin{figure} \par\includegraphics[width=7.9cm,clip]{3358fig3.eps} \end{figure}$ Figure 3: Comparison of the observed intensity ratios [O I](63 $\mu$ m)/[C II] $_{\rm PDR}$ and ([O I](63 $\mu$ m)+[C II] $_{\rm PDR}$ )/TIR_c with PDR models (Kaufman et al. 1999) at the six positions in M 83 and M 51.
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In the text

$\begin{figure} \par\includegraphics[width=14.4cm,clip]{3358fig4.eps} \end{figure}$ Figure 4: Comparison of the observed line intensity ratios [C II] $_{\rm PDR}$ /[C I](1-0), [C I](1-0)/CO(3-2), CO(3-2)/CO(1-0), [C II] $_{\rm PDR}$ /CO(3-2) and [O I](63 $\mu$ m)/[C II] $_{\rm PDR}$ in M 83 and M 51 with PDR model calculations by Kaufman et al. (1999). The drawn contours correspond to the observed intensity ratios while the dashed contours are those for the 20% uncertainty. The greyscale images show the reduced $\chi ^2$ of the fit. The position of the minimum reduced chi squared is marked by a white cross (Table 7). The horizontal black line shows the FUV flux $G_{\rm0,obs}$ calculated from the observed TIR $_{\rm c}$ flux densities.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3358fig1.eps} \end{figure}$	Figure 1: Spectra of M 83 at the central and two spiral arm positions (Table 2). Offsets are given in arcseconds relative to the (0, 0) position (Table 1). Velocities are relative to LSR. All spectra are on the $T_{\rm mb}$ scale. The ¹²CO data are at a common resolution of 80''. The [C I] and ¹³CO data are at their original resolutions listed in Table 2.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{3358fig2.eps} \end{figure}$	Figure 2: Spectra of M 51 at the central and two spiral arm positions (cf. Fig. 1).
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$\begin{figure} \par\includegraphics[width=7.9cm,clip]{3358fig3.eps} \end{figure}$	Figure 3: Comparison of the observed intensity ratios [O I](63 $\mu$ m)/[C II] $_{\rm PDR}$ and ([O I](63 $\mu$ m)+[C II] $_{\rm PDR}$ )/TIR_c with PDR models (Kaufman et al. 1999) at the six positions in M 83 and M 51.
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