All Figures

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig1.ps} \end{figure}$ Figure 1: Scaled intensity line profiles for the non-LTE models with $v_{\rm th}=0.6$ km s^-1 ( left) and $v_{\rm th}=1.0$ km s^-1 ( right). From inside out, the dashed line has emerging maser flux $T_{\rm b}\Delta \Omega = 10^8$ K sr, the short-dashed line has $T_{\rm b}\Delta \Omega = 10^{10}$ K sr and the solid line has $T_{\rm b}\Delta \Omega = 10^{11}$ K sr.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig2.ps} \end{figure}$ Figure 2: Line width as a function of emerging maser flux $T_{\rm b}\Delta \Omega$ for models with different thermal width. The thick solid line is the model for $v_{\rm th}=1.0$ km s^-1 with [ $\Gamma + \Gamma _\nu ] = 5.0$ , the other lines are for [ $\Gamma + \Gamma _\nu ] = 1.0$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig3.ps} \end{figure}$ Figure 3: Skewness parameter as a function of emerging maser brightness $T_{\rm b}\Delta \Omega$ . The lines are labeled for different thermal width. The shaded areas indicate the $3\sigma$ errors when including observational errors as described in the text.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig4.eps} \end{figure}$ Figure 4: Skewness and line widths for from $v_{\rm th} = 0.8$ ( left) and 1.0 km s^-1 ( right) when including a velocity shift $\Delta V_{\rm m}$ of 0.4 (thin solid), 0.6 (short-dashed), 0.8 (dashed-dotted) and 1.2 km s^-1 (long-dashed) as a function of emerging maser brightness $T_{\rm b}\Delta \Omega$ . The thick solid line indicates the result with constant velocity along the maser path. Due to the computational requirements we have not calculated the full brightness temperature range for the models which have a velocity gradient.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig5.ps} \end{figure}$ Figure 5: Line widths of the observed maser features as a function of emerging flux. The error bars are the $3\sigma$ errors.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig6.ps} \end{figure}$ Figure 6: Skewness parameter of the observed maser features as a function of emerging flux. The error bars indicate $3\sigma$ errors and the dashed-dotted line is the weighted average.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig1.ps} \end{figure}$	Figure 1: Scaled intensity line profiles for the non-LTE models with $v_{\rm th}=0.6$ km s^-1 ( left) and $v_{\rm th}=1.0$ km s^-1 ( right). From inside out, the dashed line has emerging maser flux $T_{\rm b}\Delta \Omega = 10^8$ K sr, the short-dashed line has $T_{\rm b}\Delta \Omega = 10^{10}$ K sr and the solid line has $T_{\rm b}\Delta \Omega = 10^{11}$ K sr.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig2.ps} \end{figure}$	Figure 2: Line width as a function of emerging maser flux $T_{\rm b}\Delta \Omega$ for models with different thermal width. The thick solid line is the model for $v_{\rm th}=1.0$ km s^-1 with [ $\Gamma + \Gamma _\nu ] = 5.0$ , the other lines are for [ $\Gamma + \Gamma _\nu ] = 1.0$ .
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig3.ps} \end{figure}$	Figure 3: Skewness parameter as a function of emerging maser brightness $T_{\rm b}\Delta \Omega$ . The lines are labeled for different thermal width. The shaded areas indicate the $3\sigma$ errors when including observational errors as described in the text.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig5.ps} \end{figure}$	Figure 5: Line widths of the observed maser features as a function of emerging flux. The error bars are the $3\sigma$ errors.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2430fig6.ps} \end{figure}$	Figure 6: Skewness parameter of the observed maser features as a function of emerging flux. The error bars indicate $3\sigma$ errors and the dashed-dotted line is the weighted average.
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