All Figures

$\begin{figure} \par\includegraphics[angle=90,width=12cm,clip]{fig3.ps} \end{figure}$ Figure 1: Temperature and electron density structure for the model of test atmosphere.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=12cm,clip]{fig4.ps} \end{figure}$ Figure 2: The behaviour of the population ratio $\zeta$ (n) for 3 $\le$ n $\le$ 9 as a function of the column mass.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=12cm,clip]{fig1.ps} \end{figure}$ Figure 3: The behaviour of the population ratio $\zeta$ (n) for 10 $\le$ n $\le$ 15 as a function of the column mass.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=12cm,clip]{fig2.ps} \end{figure}$ Figure 4: The behaviour of the population ratio $\zeta$ (n) for 16 $\le$ n $\le$ 20 as a function of the column mass.
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In the text