All Figures

$\begin{figure} \par\includegraphics*[width=13.8cm,clip]{3274fig1.eps}\end{figure}$ Figure 1: A sample of spectra in the range of 4275 to 4460 Å from areas with different surface brightnesses for NGC 6302. The corresponding positions are marked in Fig. 15. To emphasize the variation of the $[\mbox{O {\sc iii}}](\lambda~4959 + \lambda~5007)/\lambda~4363$ ratio, the flux scale was normalized to the peak of $[\mbox{O {\sc iii}}]\lambda~4959$ .
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In the text

$\begin{figure} \par\includegraphics*[width=13.8cm,clip]{3274fig2.eps}\end{figure}$ Figure 2: A sample of spectra in the range of 5650 to 5850 Å from areas with different surface brightnesses for NGC 2440. The corresponding positions are marked in Fig. 9. To emphasize the variation of the $[\mbox{N {\sc ii}}](\lambda~6548 + \lambda~6583)/\lambda~5755$ ratio, the flux scale was normalized to the peak of $[\mbox{N {\sc ii}}]\lambda~6548$ .
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In the text

$\begin{figure} \par\includegraphics*[width=8.8cm]{3274fig3.eps}\end{figure}$ Figure 3: A sample of spectra showing the observed Balmer discontinuity from different surface brightnesses for NGC 7009. The corresponding positions are marked in Fig 9. The scale of flux was normalized to the flux of H11.
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In the text

$\begin{figure} \par\includegraphics*[width=8.8cm]{3274fig4.eps}\end{figure}$ Figure 4: NGC 1535. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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In the text

$\begin{figure} \includegraphics[scale=0.64]{3274f24.eps} \end{figure}$ Figure 24: $T_{{\rm e}}(\mbox{N {\sc ii}})$ vs. $T_{{\rm e}}(\mbox{O {\sc iii}})$ for NGC 2438.
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In the text

$\begin{figure} \includegraphics[scale=0.64]{3274f25.eps} \end{figure}$ Figure 25: Same as Fig. 24, but for NGC 2440.
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In the text

$\begin{figure} \includegraphics[scale=0.64]{3274f26.eps} \end{figure}$ Figure 26: Same as Fig. 24, but for NGC 3132.
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In the text

$\begin{figure} \includegraphics[scale=0.64]{3274f27.eps} \end{figure}$ Figure 27: Same as Fig. 24, but for NGC 6302.
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In the text

$\begin{figure} \includegraphics[scale=0.64]{3274f28.eps}\end{figure}$ Figure 28: Same as Fig. 24, but for NGC 7009.
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In the text

$\begin{figure} \par\includegraphics*[width=17cm,clip]{3274f29.eps}\end{figure}$ Figure 29: $T_{{\rm e}}(\mbox{O {\sc iii}})$ vs. ${\rm log} N_{{\rm e}}(\mbox{S {\sc ii}})$ for NGC 2440 and NGC 6302. The data analyzed for these two objects are limited to the bright regions of the nebulae, where the correlation between temperature and density can be observed.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig5.eps}\end{figure}$ Figure 5: NGC 1535. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig6.eps}\end{figure}$ Figure 6: NGC 2438. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig7.eps}\end{figure}$ Figure 7: NGC 2438. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig8.eps}\end{figure}$ Figure 8: NGC 2440. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig9.eps}\end{figure}$ Figure 9: NGC 2440. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ , $T_{{\rm e}}(\mbox{N {\sc ii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f10.eps}\end{figure}$ Figure 10: NGC 3132. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f11.eps}\end{figure}$ Figure 11: NGC 3132. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f12.eps}\end{figure}$ Figure 12: NGC 3242. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f13.eps}\end{figure}$ Figure 13: NGC 3242. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f14.eps}\end{figure}$ Figure 14: NGC 6302. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ and $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f15.eps}\end{figure}$ Figure 15: NGC 6302. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f16.eps}\end{figure}$ Figure 16: NGC 6563. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f17.eps}\end{figure}$ Figure 17: NGC 6563. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f18.eps}\end{figure}$ Figure 18: NGC 6781. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f19.eps}\end{figure}$ Figure 19: NGC 6781. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm]{3274f20.eps}\end{figure}$ Figure 20: NGC 6853. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3274f21.eps}\end{figure}$ Figure 21: NGC 6853. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3274f22.eps}\end{figure}$ Figure 22: NGC 7009. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3274f23.eps}\end{figure}$ Figure 23: NGC 7009. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ , $T_{{\rm e}}(\mbox{N {\sc ii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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In the text

$\begin{figure} \par\includegraphics*[width=13.8cm,clip]{3274fig1.eps}\end{figure}$	Figure 1: A sample of spectra in the range of 4275 to 4460 Å from areas with different surface brightnesses for NGC 6302. The corresponding positions are marked in Fig. 15. To emphasize the variation of the $[\mbox{O {\sc iii}}](\lambda~4959 + \lambda~5007)/\lambda~4363$ ratio, the flux scale was normalized to the peak of $[\mbox{O {\sc iii}}]\lambda~4959$ .
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$\begin{figure} \par\includegraphics*[width=13.8cm,clip]{3274fig2.eps}\end{figure}$	Figure 2: A sample of spectra in the range of 5650 to 5850 Å from areas with different surface brightnesses for NGC 2440. The corresponding positions are marked in Fig. 9. To emphasize the variation of the $[\mbox{N {\sc ii}}](\lambda~6548 + \lambda~6583)/\lambda~5755$ ratio, the flux scale was normalized to the peak of $[\mbox{N {\sc ii}}]\lambda~6548$ .
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$\begin{figure} \par\includegraphics*[width=8.8cm]{3274fig3.eps}\end{figure}$	Figure 3: A sample of spectra showing the observed Balmer discontinuity from different surface brightnesses for NGC 7009. The corresponding positions are marked in Fig 9. The scale of flux was normalized to the flux of H11.
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$\begin{figure} \par\includegraphics*[width=8.8cm]{3274fig4.eps}\end{figure}$	Figure 4: NGC 1535. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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$\begin{figure} \includegraphics[scale=0.64]{3274f24.eps} \end{figure}$	Figure 24: $T_{{\rm e}}(\mbox{N {\sc ii}})$ vs. $T_{{\rm e}}(\mbox{O {\sc iii}})$ for NGC 2438.
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$\begin{figure} \includegraphics[scale=0.64]{3274f25.eps} \end{figure}$	Figure 25: Same as Fig. 24, but for NGC 2440.
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$\begin{figure} \includegraphics[scale=0.64]{3274f26.eps} \end{figure}$	Figure 26: Same as Fig. 24, but for NGC 3132.
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$\begin{figure} \includegraphics[scale=0.64]{3274f27.eps} \end{figure}$	Figure 27: Same as Fig. 24, but for NGC 6302.
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$\begin{figure} \includegraphics[scale=0.64]{3274f28.eps}\end{figure}$	Figure 28: Same as Fig. 24, but for NGC 7009.
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$\begin{figure} \par\includegraphics*[width=17cm,clip]{3274f29.eps}\end{figure}$	Figure 29: $T_{{\rm e}}(\mbox{O {\sc iii}})$ vs. ${\rm log} N_{{\rm e}}(\mbox{S {\sc ii}})$ for NGC 2440 and NGC 6302. The data analyzed for these two objects are limited to the bright regions of the nebulae, where the correlation between temperature and density can be observed.
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig5.eps}\end{figure}$	Figure 5: NGC 1535. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig6.eps}\end{figure}$	Figure 6: NGC 2438. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig7.eps}\end{figure}$	Figure 7: NGC 2438. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig8.eps}\end{figure}$	Figure 8: NGC 2440. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274fig9.eps}\end{figure}$	Figure 9: NGC 2440. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ , $T_{{\rm e}}(\mbox{N {\sc ii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f10.eps}\end{figure}$	Figure 10: NGC 3132. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f11.eps}\end{figure}$	Figure 11: NGC 3132. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f12.eps}\end{figure}$	Figure 12: NGC 3242. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ and $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f13.eps}\end{figure}$	Figure 13: NGC 3242. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f14.eps}\end{figure}$	Figure 14: NGC 6302. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ and $N_{{\rm e}}(\mbox{Cl {\sc iii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f15.eps}\end{figure}$	Figure 15: NGC 6302. Spatial profiles of $\rm H\beta$ flux (in units of 10^-14 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f16.eps}\end{figure}$	Figure 16: NGC 6563. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f17.eps}\end{figure}$	Figure 17: NGC 6563. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f18.eps}\end{figure}$	Figure 18: NGC 6781. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f19.eps}\end{figure}$	Figure 19: NGC 6781. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.8cm]{3274f20.eps}\end{figure}$	Figure 20: NGC 6853. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3274f21.eps}\end{figure}$	Figure 21: NGC 6853. Spatial profiles of $\rm H\beta$ flux (in units of 10^-15 erg cm^-2 s^-1) and $T_{{\rm e}}(\mbox{N {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3274f22.eps}\end{figure}$	Figure 22: NGC 7009. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1) and $N_{{\rm e}}(\mbox{S {\sc ii}})$ , $N_{{\rm e}}(\mbox{Ar {\sc iv}})$ and $N_{{\rm e}}(\mbox{S {\sc ii}})$ .
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$\begin{figure} \par\includegraphics[width=8.6cm,clip]{3274f23.eps}\end{figure}$	Figure 23: NGC 7009. Spatial profiles of $\rm H\beta$ flux (in units of 10^-13 erg cm^-2 s^-1), $T_{{\rm e}}(\mbox{O {\sc iii}})$ , $T_{{\rm e}}(\mbox{N {\sc ii}})$ and $T_{{\rm e}}(\rm {Bal}$ ).
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