All Figures

$\begin{figure} \par {\includegraphics[width=7.8cm,clip]{2404fg01.eps} } \end{figure}$ Figure 1: H $\alpha$ image with the spectroscopic slits overplotted. North is up, and east is on the left. The image display scale is logarithmic.
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In the text

$\begin{figure} \par {\includegraphics[width=16cm]{2404fg02.eps} } \end{figure}$ Figure 2: Optical spectrum of NGC 588 shown in two flux scales.
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In the text

$\begin{figure} \par {\includegraphics[width=7.8cm,clip]{2404fg03.eps} } \end{figure}$ Figure 3: Curves of E_B-V(x) and $F_{\beta }^{\rm der}(x)$ along the CAHA slit. The E_B-V(x) curve does not include the foreground Galactic contribution.
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In the text

$\begin{figure} {\includegraphics[width=7.7cm]{2404fg04.eps} } \end{figure}$ Figure 4: Residuals of the computation of $F_{\beta }^{\rm der}(x)$ and E_B-V(x).
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In the text

$\begin{figure} \par {\includegraphics[width=8cm]{2404fg05.eps} } \end{figure}$ Figure 5: Map of E_B-V established with the continuum-free H $\alpha$ and H $\beta$ images. The average uncertainty of this map is ${\approx }0.03$ . The computed reddening outside the ellipse cutout is less accurate, so it is not shown here.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{ \hbox{\includegraphics[width=4.05cm]{24... ...fg08.eps}\hspace*{1mm} \includegraphics[width=3.7cm]{2404fg09.eps}}}\end{figure}$ Figure 6: ISO-SWS detected lines.
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In the text

$\begin{figure} \par {\includegraphics[width=8cm,clip]{2404fg10.eps} } \end{figure}$ Figure 7: $(T_{\rm e},\log N_{\rm e})$ diagram for the following ratios. Temperature diagnostics (with vertical error bars): [O III] $\lambda$ 4363/ $\lambda$ 5007 (full line, no symbol), [O II] $\lambda$ 73(20+30)/ $\lambda$ 372(6+9) (dotted line, square), [S II] $\lambda$ 40(69+76)/ $\lambda$ 67(16+31) (dot-dashed line, diamond), [N II] $\lambda$ 5755/ $\lambda$ 6583 (long-dashed line, circle), [O III] $\lambda$ 5007/ $\lambda$ 88 $\mu$ m (short-dashed line, triangle). Density diagnostics (with horizontal error bars): [S II] $\lambda$ 6731/ $\lambda$ 6716 (full line, triangle), [O II] $\lambda$ 3726/ $\lambda$ 3729 (short-dashed line, square), [S III] $\lambda$ 19 $\mu$ m/ $\lambda$ 34 $\mu$ m (dotted line, diamond). The error bars shown here are representative of the whole $\log N_{\rm e}$ / $T_{\rm e}$ ranges.
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In the text

$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{2404fg11.eps} } \end{figure}$ Figure 8: [S II] $\lambda$ 6731/ $\lambda$ 6716 and [O II] $\lambda$ 3726/ $\lambda$ 3729 ratio profiles along the slit. The H $\beta$ flux profile is shown in the upper panel.
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In the text

$\begin{figure} \par {\includegraphics[width=7.5cm]{2404fg12.eps} } \end{figure}$ Figure 9: Upper panel: H $\beta$ long-slit profile (full line: observed; dashed line: model). Middle panel: model of the $N_{\rm H}~\sqrt{\epsilon}$ distribution (full line: gas surrounding the source; dashed lines: Gaussian blobs). In this panel, the value of $N_{\rm H}~\sqrt{\epsilon}$ for the two Gaussian blobs was divided by 4, for better visibility. Lower panel: schematic view of the model density profile in the plane section of the optical slit. The x axis is parallel to the slit, while the z axis is parallel to the line of sight. The two blobs (represented by black dots) may actually be located at any position along z.
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In the text

$\begin{figure} \par {\includegraphics[width=8cm]{2404fg13.eps} } \end{figure}$ Figure 10: Illustration of the geometrical correction for the gas distribution of S. The arrows indicate the direction of the observer. a) Model inferred in Sect. 6.1.1. b) Possible shape of the real distribution. c) Approximation of b) adopted in photoionization models in Sects. 6-7.
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In the text

$\begin{figure} \par {\includegraphics[width=8cm]{2404fg14.eps} } \end{figure}$ Figure 11: Radial profiles of $N_{\rm H}$ , $T_{\rm e}$ , and the relative abundances of the most coolant ions, in model [DF].
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In the text

$\begin{figure} \par {\includegraphics[width=7.8cm]{2404fg15.eps} } \end{figure}$ Figure 12: Radial profiles of $N_{\rm H}$ , U, $T_{\rm e}$ ( three upper panels), and fractional [O III] $\lambda$ 5007 and [O III] $\lambda$ 88 $\mu$ m fluxes integrated through increasing circular apertures ( lower panel), in model [DG].
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In the text

$\begin{figure} \par {\includegraphics[width=7.8cm]{2404fg16.eps} } \end{figure}$ Figure 13: Zones of extraction of spectra in Sect. 7.4.
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In the text

$\begin{figure} \par {\includegraphics[width=7.5cm]{2404fg17.eps} } \end{figure}$ Figure B.1: Profiles of H $\beta$ ( upper panel), [O III] $\lambda$ 5007/H $\beta$ ( middle panel), and [O III] $\lambda$ 5007/[O II] $\lambda$ 372(6+9) ( lower panel) along the optical slit.

In the text

$\begin{figure} \par {\includegraphics[width=7.8cm]{2404fg18.eps} } \end{figure}$ Figure B.2: Map of the nebular [O III] $\lambda$ 5007/H $\alpha$ ratio. The ratio is too noisy to be shown outside the ellipse cutout.

In the text

$\begin{figure} \par {\includegraphics[width=7.8cm,clip]{2404fg01.eps} } \end{figure}$	Figure 1: H $\alpha$ image with the spectroscopic slits overplotted. North is up, and east is on the left. The image display scale is logarithmic.
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$\begin{figure} \par {\includegraphics[width=16cm]{2404fg02.eps} } \end{figure}$	Figure 2: Optical spectrum of NGC 588 shown in two flux scales.
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$\begin{figure} \par {\includegraphics[width=7.8cm,clip]{2404fg03.eps} } \end{figure}$	Figure 3: Curves of E_B-V(x) and $F_{\beta }^{\rm der}(x)$ along the CAHA slit. The E_B-V(x) curve does not include the foreground Galactic contribution.
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$\begin{figure} {\includegraphics[width=7.7cm]{2404fg04.eps} } \end{figure}$	Figure 4: Residuals of the computation of $F_{\beta }^{\rm der}(x)$ and E_B-V(x).
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$\begin{figure} \par {\includegraphics[width=8cm]{2404fg05.eps} } \end{figure}$	Figure 5: Map of E_B-V established with the continuum-free H $\alpha$ and H $\beta$ images. The average uncertainty of this map is ${\approx }0.03$ . The computed reddening outside the ellipse cutout is less accurate, so it is not shown here.
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$\begin{figure} \par\resizebox{8.8cm}{!}{ \hbox{\includegraphics[width=4.05cm]{24... ...fg08.eps}\hspace*{1mm} \includegraphics[width=3.7cm]{2404fg09.eps}}}\end{figure}$	Figure 6: ISO-SWS detected lines.
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$\begin{figure} \par {\includegraphics[width=7.5cm,clip]{2404fg11.eps} } \end{figure}$	Figure 8: [S II] $\lambda$ 6731/ $\lambda$ 6716 and [O II] $\lambda$ 3726/ $\lambda$ 3729 ratio profiles along the slit. The H $\beta$ flux profile is shown in the upper panel.
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$\begin{figure} \par {\includegraphics[width=8cm]{2404fg13.eps} } \end{figure}$	Figure 10: Illustration of the geometrical correction for the gas distribution of S. The arrows indicate the direction of the observer. a) Model inferred in Sect. 6.1.1. b) Possible shape of the real distribution. c) Approximation of b) adopted in photoionization models in Sects. 6-7.
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$\begin{figure} \par {\includegraphics[width=8cm]{2404fg14.eps} } \end{figure}$	Figure 11: Radial profiles of $N_{\rm H}$ , $T_{\rm e}$ , and the relative abundances of the most coolant ions, in model [DF].
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$\begin{figure} \par {\includegraphics[width=7.8cm]{2404fg15.eps} } \end{figure}$	Figure 12: Radial profiles of $N_{\rm H}$ , U, $T_{\rm e}$ ( three upper panels), and fractional [O III] $\lambda$ 5007 and [O III] $\lambda$ 88 $\mu$ m fluxes integrated through increasing circular apertures ( lower panel), in model [DG].
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$\begin{figure} \par {\includegraphics[width=7.8cm]{2404fg16.eps} } \end{figure}$	Figure 13: Zones of extraction of spectra in Sect. 7.4.
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