All Figures

$\begin{figure} \par\includegraphics[angle=-90,width=9cm,clip]{3021fig1.ps} \end{figure}$ Figure 1: Distribution of total astrometric errors for a $1\hbox {$^\circ $ }$ relative source separation along declination at declination $50\hbox {$^\circ $ }$ . All perturbating errors (calibrator position, Earth orientation parameters, station coordinates, dry and wet troposphere parameters) are considered together in thissimulation.
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In the text

$\begin{figure} \par\includegraphics[height=8cm,width=7cm,clip]{3021pltA.ps}\hspace*{6mm} \includegraphics[height=8cm,width=7cm,clip]{3021pltD.ps} \end{figure}$ Figure 2: Astrometric accuracy as a function of the relative source separation for a target-calibrator pair observed with the VLBA at a declination of $+25\hbox {$^\circ $ }$ . Each error component is represented with a different symbol and the total contributing error is also plotted.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{3021figA.ps} \end{figure}$ Figure A.1: Astrometric errors $\Delta\alpha\cos\delta$ and $\Delta \delta$ (respectively left and right) as a function of declination. The two upper plots are for the case $\alpha-\alpha_0=(1/\cos\delta)\hbox{$^\circ$ }$ and $\delta -\delta _0 =0\hbox {$^\circ $ }$ while the two lower plots are for the case $\alpha -\alpha _0 = 0\hbox {$^\circ $ }$ and $\delta -\delta _0= 1\hbox {$^\circ $ }$ . The continuous dotted lines show the errors derived from the Shapiro et al. (1979) formulae. The stars show the errors from our simulations at six declinations from $-25\hbox {$^\circ $ }$ to $85\hbox {$^\circ $ }$ .

In the text

$\begin{figure} \par\includegraphics[angle=-90,width=9cm,clip]{3021fig1.ps} \end{figure}$	Figure 1: Distribution of total astrometric errors for a $1\hbox {$^\circ $ }$ relative source separation along declination at declination $50\hbox {$^\circ $ }$ . All perturbating errors (calibrator position, Earth orientation parameters, station coordinates, dry and wet troposphere parameters) are considered together in thissimulation.
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$\begin{figure} \par\includegraphics[height=8cm,width=7cm,clip]{3021pltA.ps}\hspace*{6mm} \includegraphics[height=8cm,width=7cm,clip]{3021pltD.ps} \end{figure}$	Figure 2: Astrometric accuracy as a function of the relative source separation for a target-calibrator pair observed with the VLBA at a declination of $+25\hbox {$^\circ $ }$ . Each error component is represented with a different symbol and the total contributing error is also plotted.
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