$\begin{figure} \par\includegraphics[width=8.4cm,clip]{6816fig1.eps} \end{figure}$ Figure 1: IRAS colour-colour diagram of the observed sources. The evolutionary classification follows SGM, and the sources in which they did not find an optical counterpart are labelled as such. The two straight lines shown in the diagram delimit the selected colours and the curve is the line modelled by Bedijn (1987) where the AGB stars are located.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{6816fig2.eps} \end{figure}$ Figure 2: IRAS colour-colour diagram of the sources in which we detected H₂O maser emission. We also include here the two PNe previously known to harbour water masers. The nature of IRAS 17580-3111 is uncertain, although it was previously classified as a PN (see text).
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{6816fig1.eps} \end{figure}$	Figure 1: IRAS colour-colour diagram of the observed sources. The evolutionary classification follows SGM, and the sources in which they did not find an optical counterpart are labelled as such. The two straight lines shown in the diagram delimit the selected colours and the curve is the line modelled by Bedijn (1987) where the AGB stars are located.
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$\begin{figure} \par\includegraphics[width=8.4cm,clip]{6816fig2.eps} \end{figure}$	Figure 2: IRAS colour-colour diagram of the sources in which we detected H₂O maser emission. We also include here the two PNe previously known to harbour water masers. The nature of IRAS 17580-3111 is uncertain, although it was previously classified as a PN (see text).
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$\begin{figure} \par\includegraphics[angle=-90,width=8.5cm,clip]{6816fig3.eps} \end{figure}$	Figure 3: Water maser spectrum of the post-AGB star IRAS 07331+0021.
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$\begin{figure} \par\includegraphics[angle=-90,width=12.5cm,clip]{6816fig4.eps} \end{figure}$	Figure 4: Water maser spectra of the post-AGB star IRAS 16552-3050.
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$\begin{figure} \par\includegraphics[angle=-90,width=17cm,clip]{6816fig5.eps} \end{figure}$	Figure 5: Water maser spectra of the PN IRAS 17443-2949.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.8cm,clip]{6816fig6.eps} \end{figure}$	Figure 6: Water maser spectrum of the PN IRAS 17580-3111.
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$\begin{figure} \par\includegraphics[angle=-90,width=12.5cm,clip]{6816fig7.eps} \end{figure}$	Figure 7: Water maser spectra of the PN IRAS 18061-2505.
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