All Figures

$\begin{figure} \par\includegraphics[width=6.75cm,clip]{5560f1a.eps}\hspace*{5mm} \includegraphics[width=6.75cm,clip]{5560f1b.eps}\end{figure}$ Figure 1: Chemistry during the collapse phase. Surface species are designated by (s).
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{5560f2.eps}\end{figure}$ Figure 2: Temperature profiles for a protostellar switch-on time of t=2 $\times$ 10⁵ yr, adopting linear (T₁) and t² time dependences (T₂).
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=6.75cm,clip]{5560f3a.eps}\hspace*{5mm}... ...c.eps}\hspace*{5mm} \includegraphics[width=6.75cm,clip]{5560f3d.eps}\end{figure}$ Figure 3: Chemistry during standard warm-up phase - $t_{\rm f}=2$ $\times$ 10⁵ yr, T=T₂(t). Surface species are marked (s). All abundances are shown with reference to molecular hydrogen.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=6.75cm,clip]{5560f4a.eps}\hspace*{5mm} \includegraphics[width=6.75cm,clip]{5560f4b.eps}\end{figure}$ Figure 4: Chemistry during short warm-up phase - $t_{\rm f}=5$ $\times$ 10⁴ yr, T=T₂(t). Species marked (s) are surface species. All abundances are shown in reference to molecular hydrogen.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=6.85cm,clip]{5560f5a.eps}\hspace*{3mm} \includegraphics[width=6.85cm,clip]{5560f5b.eps}\end{figure}$ Figure 5: Chemistry during long warm-up phase - $t_{\rm f}=1$ $\times$ 10⁶ yr, T=T₂(t). Species marked (s) are surface species. All abundances are shown with reference to molecular hydrogen.
Open with DEXTER

In the text