All Figures

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{0186fig2.eps} \end{figure}$ Figure 2: Evolution of the SO₂, SO, H₂S, OCS and CS abundances with respect to H₂ as a function of time, for the three pre-evaporation gas phase compositions A ( left panels), B ( central panels), and C ( right panels) and the four grain mantle compositions (1 to 4, from the top to the bottom). The gas temperature is 100 K and the H₂ density is 10⁷ cm^-3.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{0186fig3.eps} \end{figure}$ Figure 3: Evolution of the SO₂, SO, H₂S, OCS and CS abundances with respect to H₂ as a function of time, using pre-evaporated gas phase composition A and the four grain mantle mixtures (1 to 4, from the top to the bottom). The gas temperature is 100 K and the density is 10⁵ cm^-3 ( a) left panels), 10⁶ cm^-3 ( b) central panels) and 10⁷ cm^-3 ( c) right panels).
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{0186fig4.eps} \end{figure}$ Figure 4: Same as Fig. 3 but with a temperature of 300 K.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0186fig5.eps} \end{figure}$ Figure 5: Evolution of the abundance ratios SO₂/SO ( upper panels), SO₂/H₂S ( middle panels) and OCS/H₂S ( lower panels) as functions of time for composition A, a gas temperature of 100 K, and densities of 10⁵ cm^-3 ( left panels), 10⁶ cm^-3 ( central panels) and 10⁷ cm^-3 ( right panels). The solid, dashed-dotted, dashed, and dotted lines represent results from models 1, 2, 3, and 4, respectively. In the upper panels, the results of model 2 and 4 are the same and represented by dashed-dotted lines.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0186fig6.eps} \end{figure}$ Figure 6: Same as Fig. 5 but with a temperature of 300 K.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0186fig7.eps} \end{figure}$ Figure 7: Comparison between the observed ratios SO₂/SO, SO₂/H₂S and OCS/H₂S towards IRAS 16293-2422 and the theoretical predictions of four models (Mod. 1, 2, 3 and 4; all with composition A) for a gas temperature of 100 K and a density of 10⁷ cm^-3. The grey empty boxes, if shown, represent those instances in which particular calculated ratios are in agreement for a range of times with the observed ones taking into account the uncertainties in the observations. The grey filled box for model 2 shows the time interval where all calculated ratios are in agreement with the observed ones.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0186fig1.eps} \end{figure}$ Figure 1: The "variation'' $\Delta X$ (see text) of the abundances of SO, H₂S, and CS divided by the amplitude ( $\Delta R = 0.1$ ) of the perturbation of the rate coefficients plotted for reactions with number between 86 and 834; i.e., all the reactions in the model exept those dealing with dust grains. The numbers indicate those reactions that induce a variation of more than 5% of the highest variation for each species.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{0186fig2.eps} \end{figure}$	Figure 2: Evolution of the SO₂, SO, H₂S, OCS and CS abundances with respect to H₂ as a function of time, for the three pre-evaporation gas phase compositions A ( left panels), B ( central panels), and C ( right panels) and the four grain mantle compositions (1 to 4, from the top to the bottom). The gas temperature is 100 K and the H₂ density is 10⁷ cm^-3.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{0186fig3.eps} \end{figure}$	Figure 3: Evolution of the SO₂, SO, H₂S, OCS and CS abundances with respect to H₂ as a function of time, using pre-evaporated gas phase composition A and the four grain mantle mixtures (1 to 4, from the top to the bottom). The gas temperature is 100 K and the density is 10⁵ cm^-3 ( a) left panels), 10⁶ cm^-3 ( b) central panels) and 10⁷ cm^-3 ( c) right panels).
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{0186fig4.eps} \end{figure}$	Figure 4: Same as Fig. 3 but with a temperature of 300 K.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0186fig6.eps} \end{figure}$	Figure 6: Same as Fig. 5 but with a temperature of 300 K.
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