\begin{table}%t12
%\centering
\par
\caption{VLBA without Saint Croix 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{SCDC}}
\begin{tabular}{lcccccccccccccccccc}
\hline\hline
\noalign {\vskip 1.0mm}
 &&\multicolumn{16}{c}{Declination of source}\\
\noalign {\vskip 0.5mm} \cline{3-19} \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)          &&183 & 563&&       62& 189&&        19& 55&&       17& 41&&         39& 27&&         ~42& 44\\
Total (mean wtrp)                &&190 & 534&&       70& 191&&        24& 71&&       26& 42&&         74& 28&&         216& 40\\
\hline
\end{tabular}
\end{table}