Table 7: EVN rms astrometric errors (in $\mu $as) for a relative source separation $(\alpha -\alpha _0)\cos\delta_0 = 1\hbox{$^\circ$ }$. Individual astrometric error contributions from station coordinate and wet troposphere uncertainties are given separately along with the total astrometric errors when all model parameters are perturbed together.
    Declination of source  
    $0\hbox{$^\circ$ }$   $25\hbox{$^\circ$ }$   $50\hbox {$^\circ $ }$   $75\hbox{$^\circ$ }$   $85\hbox {$^\circ $ }$
Error component   $\Delta\alpha \cos\delta \hfil$ $\Delta \delta $   $\Delta\alpha \cos\delta \hfil$ $\Delta \delta $   $\Delta\alpha \cos\delta \hfil$ $\Delta \delta $   $\Delta\alpha \cos\delta \hfil$ $\Delta \delta $   $\Delta\alpha \cos\delta \hfil$ $\Delta \delta $
Antenna position    5  4    5  4    6  5     5  5     5   5
Wet troposphere (mean)   55 11   37 14   52 33    73 40    65  31
Total (mean wtrp)   57 12   44 15   57 45    91 81   206 185


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