All Figures

$\begin{figure} \par\includegraphics[width=7.4cm,clip]{Fig1.eps} \end{figure}$ Figure 1: Recorded O III lines at various plasma compositions recorded at 5 ${\rm th}$ $\mu$ s a) and 10 ${\rm th}$ $\mu$ s b) after the beginning of the discharge. P and E denote discharge pressure and bank energy, respectively.
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In the text

$\begin{figure} \par\includegraphics[width=13cm,clip]{Fig2.eps} \end{figure}$ Figure 2: O III line intensity ratios during the plasma decay in various a)-d) plasma compositions. Symbols $\bullet$ , $\Delta$ and $\circ$ correspond to the I(313.3)/I(311.6), I(312.2)/I(311.6) and I(313.3)/I(312.2) O III line intensity ratios, respectively. Full lines represent line intensity ratios calculated on the basis of Eq. (1) using transition probabilities tabulated in NIST (2003). Dashed lines denote normalized experimental line intensity maximum of the He II P $\alpha$ (468.6 nm) spectral line. Electron temperature (T) is related to the 10 ${\rm th}$ $\mu$ s after the beginning of discharge when the P $\alpha$ line has its intensity maximum and the Bowen mechanism comes up to its maximum. Error bar represents estimated uncertainties of $\pm$ 8%.
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In the text

$\begin{figure} \par\includegraphics[width=7.3cm,clip]{4133f3.eps} \end{figure}$ Figure 3: O III line intensity ratios versus X = n(He)/n(O) density ratio at about 50 000 K electron temperature and electron densities higher than $3\times 10^{22}$ m^-3. The line intensity ratios are obtained in the 10 ${\rm th}$ $\mu$ s after the beginning of the discharge. The symbols $\bullet$ and $\Delta$ are related to the measured I(313.3)/I(311.6) and I(312.2)/I(311.6) O III line intensity ratios. The full and dashed lines denote their calculated values on the basis of the established Eqs. (2) and (3).
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In the text

$\begin{figure} \par\includegraphics[width=7.4cm,clip]{Fig1.eps} \end{figure}$	Figure 1: Recorded O III lines at various plasma compositions recorded at 5 ${\rm th}$ $\mu$ s a) and 10 ${\rm th}$ $\mu$ s b) after the beginning of the discharge. P and E denote discharge pressure and bank energy, respectively.
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