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$\begin{figure} \par\includegraphics[scale=0.3]{0103fig1.eps} \end{figure}$ Figure 1: Transfer along a short characteristic.
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In the text

$\begin{figure} \par\includegraphics[scale=0.4]{0103fig2.eps} \end{figure}$ Figure 2: Geometric quantities in spherical geometry.
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In the text

$\begin{figure} \par\includegraphics[scale=0.6,angle=270]{0103fig3.eps} \end{figure}$ Figure 3: Dependence of the intensities.
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In the text

$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig4.eps} \end{figure}$ Figure 4: Convergence properties of the various algorithms in terms of number of iterations.
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In the text

$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig5.eps} \end{figure}$ Figure 5: Excitation temperature versus opacity for a model considering ortho-H₂CO.
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In the text

$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig6.eps} \end{figure}$ Figure 6: Line parameters obtained for the models described in Gonzalez-Alfonso & Cernicharo (1993).
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In the text

$\begin{figure} \par\includegraphics[scale=0.6,angle=0]{0103fig7.eps} \end{figure}$ Figure 7: Effect of the overlap on the line profile of L63. The black line correspond to a model without overlap and the red lines correspond to models that include overlap.
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In the text

$\begin{figure} \par\includegraphics[scale=0.9,angle=0]{0103fig8.eps} \end{figure}$ Figure 8: Effect of overlap on the N₂H⁺, HCN, and HNC J=1-0, 2-1, and 3-2 lines. Red lines correspond to models without introduction of the overlap and black lines to models considering line overlap. The differences between integrated intensities are given for each line. The intensity scale is antenna temperature and are obtained using the standard values of HPBW and beam efficiency of the 30 m IRAM telescope.
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In the text

$\begin{figure} \par\includegraphics[scale=0.55,angle=0]{0103fig9.eps} \end{figure}$ Figure 9: Effect of overlap on relative line intensities. The black curve corresponds to a model that includes line overlap and the red line to a model without overlap, the latter being scaled by the integrated intensity ratio.
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In the text

$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig10.eps} \end{figure}$ Figure 10: Excitation temperatures ratios for overlapping lines with different line strengths.
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In the text

$\begin{figure} \par\includegraphics[scale=0.3]{0103fig11.eps} \end{figure}$ Figure A.1: Notation adopted in plan-parallel geometry.
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In the text

$\begin{figure} \par\includegraphics[scale=0.4]{0103fig12.eps} \end{figure}$ Figure B.1: Definition of geometrical quantities.
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In the text

$\begin{figure} \par\includegraphics[scale=0.4]{0103fig13.eps} \end{figure}$ Figure B.2: Definition of geometrical quantities.
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In the text

$\begin{figure} \par\includegraphics[scale=0.3]{0103fig1.eps} \end{figure}$	Figure 1: Transfer along a short characteristic.
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$\begin{figure} \par\includegraphics[scale=0.4]{0103fig2.eps} \end{figure}$	Figure 2: Geometric quantities in spherical geometry.
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$\begin{figure} \par\includegraphics[scale=0.6,angle=270]{0103fig3.eps} \end{figure}$	Figure 3: Dependence of the intensities.
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$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig4.eps} \end{figure}$	Figure 4: Convergence properties of the various algorithms in terms of number of iterations.
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$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig5.eps} \end{figure}$	Figure 5: Excitation temperature versus opacity for a model considering ortho-H₂CO.
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$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig6.eps} \end{figure}$	Figure 6: Line parameters obtained for the models described in Gonzalez-Alfonso & Cernicharo (1993).
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$\begin{figure} \par\includegraphics[scale=0.6,angle=0]{0103fig7.eps} \end{figure}$	Figure 7: Effect of the overlap on the line profile of L63. The black line correspond to a model without overlap and the red lines correspond to models that include overlap.
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$\begin{figure} \par\includegraphics[scale=0.55,angle=0]{0103fig9.eps} \end{figure}$	Figure 9: Effect of overlap on relative line intensities. The black curve corresponds to a model that includes line overlap and the red line to a model without overlap, the latter being scaled by the integrated intensity ratio.
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$\begin{figure} \par\includegraphics[scale=0.35,angle=270]{0103fig10.eps} \end{figure}$	Figure 10: Excitation temperatures ratios for overlapping lines with different line strengths.
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$\begin{figure} \par\includegraphics[scale=0.3]{0103fig11.eps} \end{figure}$	Figure A.1: Notation adopted in plan-parallel geometry.
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$\begin{figure} \par\includegraphics[scale=0.4]{0103fig12.eps} \end{figure}$	Figure B.1: Definition of geometrical quantities.
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$\begin{figure} \par\includegraphics[scale=0.4]{0103fig13.eps} \end{figure}$	Figure B.2: Definition of geometrical quantities.
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