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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{8448fig1.eps}\end{figure}$ Figure 1: VLBI images of NRAO 150 at 86 GHz a), 43 GHz b), 8.4 GHz c), and 2.3 GHz d). The 2.3 GHz image was obtained by Kovalev et al. (2007). In images a)- d), the lower contours correspond to 1.0%, 0.2%, 0.15% and 0.5% of the corresponding image peak of 1.05 Jy/beam, 3.84 Jy/beam, 5.55 Jy/beam, and 0.69 Jy/beam, respectively. The upper contours increase by factors of 2. Other image parameters of the a), b) and c) maps are given in Table 1. The 2.3 GHz convolving beam is ( $7.4\times 2.6$ ) $\rm {mas}^{2}$ with major-axis position angle at $-2^{\circ }$ . The 86 GHz image illustrates the capability of the GMVA to achieve angular resolutions of up to 40 $\mu$ as, with dynamic ranges of up to 100:1 and notable image fidelity, as suggested by the matching 86 GHz and 43 GHz source structures. In the 43 GHz image, the circles are centred at the positions of the Gaussian model components. The radius of such circles symbolise the FWHM size of the corresponding modelcomponent.
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{8448fig2.eps}\end{figure}$ Figure 2: Selection of 18 of the 34 NRAO 150 images obtained from 1997 to 2007 with the VLBA at 43 GHz. All images have been convolved with the same circular beam of 0.16 mas. The common intensity scale ranges from 0.025 Jy/beam to 4.128 Jy/beam. The positions of the fitted Gaussians are indicated by the black crosses, whereas the black circles (of radius equal to the FWHM of each Gaussian) symbolise their size. A movie corresponding to these images is available with the online version of the article.
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In the text

$\begin{figure} \par\includegraphics[width=17cm,clip]{8448fig3.eps}\end{figure}$ Figure 3: From right to left, 86 GHz and 43 GHz inner jet axis evolution, projected trajectories of the 43 GHz model components, and their corresponding 43 GHz flux evolution. The crosses in the middle plot symbolise the position errors (computed using the prescriptions by Jorstad et al. 2005), whereas the superimposed bent lines represent the fitted trajectories of each model component (labelled in the Figure). Filled diamonds in the flux evolution plots symbolise upper limits (see Table 3).
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In the text