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$\begin{figure} \par\includegraphics[width = 17cm]{3721_fig1.eps} \end{figure}$ Figure 1: Measured relative proper motions of the VLBA H₂O maser features in AFGL 5142. For each of the time persistent features, the top and the bottom panels report the time variation of, respectively, the Dec and the RA offsets (relative to the reference feature "1''). In each panel, the dotted line shows the proper motion calculated by the (error-weighted) linear least-squares fit of the positional offsets with time. No proper motion is derived for the feature with label number "26'', since it does not show a linear variation of positional offsets with time.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{3721_fig2.eps} \par\end{figure}$ Figure 2: The radio spectral energy distribution of AFGL 5142. Filled triangles are our VLA-B measurements of the flux density at 8.4 (0.75 mJy with a $\approx$ 0 $.\!\!^{\prime\prime}$ 9 beam), 22.4 (0.7 mJy with a $\approx$ 0 $.\!\!^{\prime\prime}$ 4 beam), and 43.3 GHz ( ${\leq }0.9$ mJy with a $\approx$ 0 $.\!\!^{\prime\prime}$ 2 beam; the upper limit is indicated by the downward arrow). The asterisks are previous flux density measurements at 4.9 GHz (1.0 mJy with a $\approx$ 12 $.\!\!^{\prime\prime}$ 5 beam using VLA-D - Carpenter et al. 1990 (C90) - and 0.5 mJy with a ${\approx }4''$ beam using VLA-C - McCutcheon et al. 1991 (M91)) and 8.4 GHz (0.83 mJy with a $\approx$ 0 $.\!\!^{\prime\prime}$ 3 beam using VLA-A - Hunter et al. 1995 (H95); 1.0 mJy with a $\approx$ 7 $.\!\!^{\prime\prime}$ 7 beam using VLA-C - Torrelles et al. 1992 (T92); 1.2 mJy with a $\approx$ 7 $.\!\!^{\prime\prime}$ 5 beam using VLA-D - Carral et al. 1999 (C99)). The size of the symbols scales logarithmically with the FWHM size of the beam.
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In the text

$\begin{figure} \par\includegraphics[width=15.4cm]{3721_fig3.eps} \end{figure}$ Figure 3: VLA and VLBA results towards AFGL 5142. Upper right-hand panel: contour maps of the OVRO high-velocity emission of HCO⁺ (1 $\to$ 0) ( left) and SiO (v = 0, 2 $\to$ 1) ( right) (Hunter et al. 1999). Upper left-hand panel: positions of the 22 GHz masers detected with the VLA in 1992 ( open squares) and 1998 ( filled dots); OVRO 88 GHz ( boxed cross) and VLA 8.4 GHz ( plain cross) continuum sources (Hunter et al. 1999,1995). Bottom panel: positions of the VLBA H₂O maser features are marked with filled triangles, different colours denote the features' LSR velocities, according to the colour scale on the right-hand side of the panel, and the arrows indicate the measured absolute proper motions, whose amplitude scale is given at the bottom of the panel; the labels Ib, Ir and IIb, IIr individuate the blue-shifted and red-shifted maser clusters of Group I and Group II, respectively; the contour map (with contours representing 5, 6, 7, 8, and 9 times the 50 $\mu$ Jy beam^-1 rms noise) shows the 22 GHz VLA continuum emission; the filled circle in the upper right corner represents the restoring beam of the VLA-B 22 GHz continuum map.
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In the text