Table 10: Global VLBI array rms astrometric errors (in $\mu $as) for a relative source separation $\delta -\delta _0= 1\hbox {$^\circ $ }$. The individual astrometric error contribution from wet troposphere uncertainties is given separately along with the total astrometric errors when all model parameters are perturbed together.
    Declination of source  
    $-25\hbox {$^\circ $ }$   $0\hbox{$^\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 $   $\Delta\alpha \cos\delta \hfil$ $\Delta \delta $
Wet troposphere (mean)   60 305   26 71   10 43    9 44    5 21     5 26
Total (mean wtrp)   61 279   24 78   15 45   22 46   61 24   183 27


Source LaTeX | All tables | In the text