\begin{table}%t10
%\centering
\par
\caption{Global VLBI array rms astrometric errors (in $\mu$as) for a relative source separation
$\delta -\delta _0= 1\degr$. 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.
\label{GlobalDC}}
\par
\begin{tabular}{lcccccccccccccccccc}
\hline\hline
\noalign {\vskip 1.0mm}
&&\multicolumn{16}{c}{Declination of source}\\
\noalign {\vskip 0.5mm}   \noalign {\vskip 1.0mm} \hfil
\hfil
&&\multicolumn{2}{c}{$-25\degr$}&&\multicolumn{2}{c}{$0\degr$}&&\multicolumn{2}{c}{$25\degr$}
        &&\multicolumn{2}{c}{$50\degr$}&&\multicolumn{2}{c}{$75\degr$}&&\multicolumn{2}{c}{$85\degr$}\\
\noalign {\vskip 0.0mm}
Error component &&$\Delta\alpha\cos\delta \hfil$ &$\Delta\delta$ &&$\Delta\alpha\cos\delta \hfil$ &$\Delta\delta$&&
        $\Delta\alpha\cos\delta \hfil$&$\Delta\delta$&&$\Delta\alpha\cos\delta \hfil$&$\Delta\delta$&&
        $\Delta\alpha\cos\delta \hfil$&$\Delta\delta$&&$\Delta\alpha\cos\delta \hfil$&$\Delta\delta$\\
\noalign {\vskip 0.0mm}
\hline
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 \\
\hline
\end{tabular}
\end{table}