All Figures

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{7289fig1.eps} \end{figure}$ Figure 1: The average sensitivity achieved for each transition ( top) and the detection rate ( bottom). The ratio of the number of detected to observed objects is shown in each of the bars.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{7289fig2.eps} \end{figure}$ Figure 2: Histograms of the distribution of the asymmetry parameter $\delta v$ for the five transitions. The range of $\vert\delta v\vert< 0.25$ marked by the dotted lines corresponds to the spectra with no asymmetry.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{7289fig3.eps} \end{figure}$ Figure 3: Comparison between the velocity ranges of 6.7 GHz methanol maser (thick bars) (Szymczak et al. 2002) and ¹³CO (dotted bars) and HCO⁺ (dashed bars) line wings. The dotted vertical line marks the systemic velocity.
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In the text

$\begin{figure} \par\includegraphics[width=8.7cm,clip]{7289fig4.eps} \end{figure}$ Figure 4: Histogram of the ratio of methanol maser velocity spread to HCO⁺ line wings spread.
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In the text

$\begin{figure} \par\includegraphics[width=11.5cm,clip]{7289fi1a.eps} \end{figure}$ Figure A.1: Spectra of sources. Source names, molecules and transitions are indicated. The main beam brightness temperature ( $T_{\rm mb}$ ) is plotted against velocity ( $V_{\rm LSR}$ ). The dashed vertical line shows the systemic velocity as inferred from a Gaussian fit of one of the optically thin transition (see text for details) for each target. The dotted horizontal lines show the $T_{\rm mb}=0$ K level in each spectrum. The thick bottom bar indicates the velocity range of the 6.7 GHz methanol maser emission (Szymczak et al. 2002) for each source.

In the text

$\begin{figure}\par\includegraphics[width=11.5cm,clip]{7289fi1b.eps} \end{figure}$ Figure A.1: continued.

In the text

$\begin{figure}\par\includegraphics[width=11.5cm,clip]{7289fi1c.eps} \end{figure}$ Figure A.1: continued.

In the text

$\begin{figure}\par\includegraphics[width=11.5cm,clip]{7289fi1d.eps} \end{figure}$ Figure A.1: continued.

In the text

$\begin{figure}\par\includegraphics[width=11.5cm,clip]{7289fi1e.eps} \end{figure}$ Figure A.1: continued.

In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{7289fig1.eps} \end{figure}$	Figure 1: The average sensitivity achieved for each transition ( top) and the detection rate ( bottom). The ratio of the number of detected to observed objects is shown in each of the bars.
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{7289fig2.eps} \end{figure}$	Figure 2: Histograms of the distribution of the asymmetry parameter $\delta v$ for the five transitions. The range of $\vert\delta v\vert< 0.25$ marked by the dotted lines corresponds to the spectra with no asymmetry.
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{7289fig3.eps} \end{figure}$	Figure 3: Comparison between the velocity ranges of 6.7 GHz methanol maser (thick bars) (Szymczak et al. 2002) and ¹³CO (dotted bars) and HCO⁺ (dashed bars) line wings. The dotted vertical line marks the systemic velocity.
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$\begin{figure} \par\includegraphics[width=8.7cm,clip]{7289fig4.eps} \end{figure}$	Figure 4: Histogram of the ratio of methanol maser velocity spread to HCO⁺ line wings spread.
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