All Figures

$\begin{figure} \par\includegraphics[width=15.7cm,clip]{ms3426f1.eps} \end{figure}$ Figure 1: Normalised ISO-SWS spectra of the $\nu _2$ ro-vibrational band of gas-phase H₂O for all sources. The H₂O ice feature has been removed. The $\sim$ 5.7-6.2 $\mu$ m region toward W 33 A is particularly noisy due to the strong H₂O ice band for this source. The bottom panel shows a H₂O model spectrum for $T_{{\rm ex}}=500$ K, $N=2\times 10^{18}$ cm^-2, and b=5 km s^-1 (see Sect. 3).
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In the text

$\begin{figure} \par\includegraphics[width=7cm,clip]{ms3426f2.eps} \end{figure}$ Figure 2: Example of the $\chi ^2$ distribution for MonR2 IRS3 for b=5 km s^-1 (filled star and solid contours) and b=2 km s^-1 (open star and dashed contours) showing that for low b-values ( $b\protect\la2$ km s^-1) the column density is not well constrained. The stars indicate the minimum $\chi ^2$ and the contours are 0.2, 1, 3, and 6% above this minimum. The latter contour roughly corresponds to a 3 $\sigma$ deviation of the model from the observed H₂O band for this source.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{ms3426f3.eps} \end{figure}$ Figure 3: Example of some good fitting models for the observed $\nu _2$ ro-vibrational band of gas-phase H₂O toward MonR2 IRS3, for different excitation temperatures using b=5 km s^-1 and $N=5\times 10^{17}$ cm^-2 (Table 2). The model spectra are shifted by -0.1, -0.2, and -0.3 respectively (from top to bottom).
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In the text

$\begin{figure} \par\includegraphics[width=6.3cm,clip]{ms3426f4.eps} \end{figure}$ Figure 4: Correlation between the H₂O excitation temperature and that of C₂H₂, a good tracer of the warm gas (Lahuis & van Dishoeck 2000). Only those sources are shown for which both excitation temperatures are determined, except for MonR2 IRS3 for which $T_{{\rm ex}}$ (¹³CO) instead of $T_{{\rm ex}}$ (C₂H₂) is used (Giannakopoulou et al. 1997). The cross denotes typical error bars.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{ms3426f5.eps} \end{figure}$ Figure 5: The H₂O gas-phase abundances from Table 2 (left panel) and the H₂O ice abundances from Gibb & Whittet (2002) and Gerakines et al. (1999) (right panel) versus $T_{{\rm ex}}$ (C₂H₂) (Lahuis & van Dishoeck 2000; Boonman et al. 2003a). The ice abundances are with respect to cold H₂ only, inferred from the cold ¹³CO component from Mitchell et al. (1990) in a similar way as for the warm component (see text). The crosses denote typical error bars for $T_{{\rm ex}}\protect\ga20$ 0 K. For MonR2 IRS3 and S 140 IRS1 $T_{{\rm ex}}$ (¹³CO) is used (Giannakopoulou et al. 1997; Mitchell et al. 1990).
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In the text

$\begin{figure} \par\includegraphics[width=6.5cm,clip]{ms3426f6.eps} \end{figure}$ Figure 6: Gas/solid ratio for H₂O versus $T_{{\rm ex}}$ (C₂H₂). For MonR2 IRS3 and S 140 IRS1 $T_{{\rm ex}}$ (¹³CO) is used (Giannakopoulou et al. 1997; Mitchell et al. 1990). The dashed line shows the least-squares fit through the data points.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{ms3426f3.eps} \end{figure}$	Figure 3: Example of some good fitting models for the observed $\nu _2$ ro-vibrational band of gas-phase H₂O toward MonR2 IRS3, for different excitation temperatures using b=5 km s^-1 and $N=5\times 10^{17}$ cm^-2 (Table 2). The model spectra are shifted by -0.1, -0.2, and -0.3 respectively (from top to bottom).
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$\begin{figure} \par\includegraphics[width=6.5cm,clip]{ms3426f6.eps} \end{figure}$	Figure 6: Gas/solid ratio for H₂O versus $T_{{\rm ex}}$ (C₂H₂). For MonR2 IRS3 and S 140 IRS1 $T_{{\rm ex}}$ (¹³CO) is used (Giannakopoulou et al. 1997; Mitchell et al. 1990). The dashed line shows the least-squares fit through the data points.
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