All Figures

$\begin{figure} \par\includegraphics[width=7.8cm,clip]{2869fig2.ps}\end{figure}$ Figure 2: Detailed spectrum showing the region centered at 6828 Å. The histogram is the observed spectrum. The dotted-dashed line represents a two-Gaussian fit, with the narrow and broad components represented by dotted and dashed lines respectively. The broad feature redwards of the [Kr III] line is identified as the O VI Raman line (see text).
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In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2869fig3.ps}\end{figure}$ Figure 3: The UV and optical spectrum showing the 2200 Å extinction bump which can be used to estimate total reddening towards NGC 7027. The solid and dotted lines show respectively the observed spectrum and that dereddened assuming $c({\rm H}\beta )=1.44$ . The dashed line is a synthesized theoretical spectrum of recombination line and continuum emission from ionized hydrogen and helium.
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In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{2869fig4}\end{figure}$ Figure 4: Plasma diagnostic diagram. Each curve is labelled with an ID number given in Table 5.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{2869fig5.ps}\end{figure}$ Figure 5: The He I $\lambda 6678/\lambda 4471$ , $\lambda 6678/\lambda 5876$ , $\lambda 7281/\lambda 5876$ and $\lambda 7281/\lambda 6678$ ratios as a function of electron temperature for $\log N_{\rm e}=4$ (dotted line), 5 (solid line) and 6 (dashed line) (cm^-3). The boxes are the observed values with measurement uncertainties.
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In the text

$\begin{figure} \par\includegraphics[width=16cm,clip]{2869fig6.ps}\end{figure}$ Figure 6: Intensity ratios of a) H I Balmer lines to H 11 $\lambda$ 3770 and b) He II Pfund lines to He II $\lambda$ 4686, as a function of the principal quantum number n of the upper level of the transition. H 16 at 3703.86 Å is blended with the He I $\lambda 3705.12$ line. Solid lines are theoretical values for electron densities of $N_{\rm e}=10^2$ to 10⁶ cm^-3 at a constant electron temperature of 12 800 K.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2869fig7.ps}\end{figure}$ Figure 7: Comparison of C, N, O and Ne ionic abundances derived from ORLs with those from UV, optical and IR CELs.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1a.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0}\end{figure}$ Figure 1: Optical spectrum of NGC 7027. A `+' attached to a line identification means that the line is blended with other emission features.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1b.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1c.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1d.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1e.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1f.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1g.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1h.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1i.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure}\par\epsfig{file=2869fig1j.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$ Figure 1: continued.
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In the text

$\begin{figure} \par\includegraphics[width=7.8cm,clip]{2869fig2.ps}\end{figure}$	Figure 2: Detailed spectrum showing the region centered at 6828 Å. The histogram is the observed spectrum. The dotted-dashed line represents a two-Gaussian fit, with the narrow and broad components represented by dotted and dashed lines respectively. The broad feature redwards of the [Kr III] line is identified as the O VI Raman line (see text).
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$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2869fig3.ps}\end{figure}$	Figure 3: The UV and optical spectrum showing the 2200 Å extinction bump which can be used to estimate total reddening towards NGC 7027. The solid and dotted lines show respectively the observed spectrum and that dereddened assuming $c({\rm H}\beta )=1.44$ . The dashed line is a synthesized theoretical spectrum of recombination line and continuum emission from ionized hydrogen and helium.
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$\begin{figure} \par\includegraphics[width=7.2cm,clip]{2869fig4}\end{figure}$	Figure 4: Plasma diagnostic diagram. Each curve is labelled with an ID number given in Table 5.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{2869fig5.ps}\end{figure}$	Figure 5: The He I $\lambda 6678/\lambda 4471$ , $\lambda 6678/\lambda 5876$ , $\lambda 7281/\lambda 5876$ and $\lambda 7281/\lambda 6678$ ratios as a function of electron temperature for $\log N_{\rm e}=4$ (dotted line), 5 (solid line) and 6 (dashed line) (cm^-3). The boxes are the observed values with measurement uncertainties.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2869fig7.ps}\end{figure}$	Figure 7: Comparison of C, N, O and Ne ionic abundances derived from ORLs with those from UV, optical and IR CELs.
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$\begin{figure}\par\epsfig{file=2869fig1a.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0}\end{figure}$	Figure 1: Optical spectrum of NGC 7027. A `+' attached to a line identification means that the line is blended with other emission features.
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$\begin{figure}\par\epsfig{file=2869fig1b.ps, height=22cm, bbllx=44, bblly=54, bburx=550, bbury=758, clip=, angle=0} \end{figure}$	Figure 1: continued.
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