\begin{table}%t11
%\centering
\par
\caption{VLBA without Saint Croix rms astrometric errors (in $\mu$as) for a relative source separation
$(\alpha -\alpha _0)\cos\delta_0 = 1\degr$. 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{SCRA}}
\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)          &&  62 & 171&&       28& 47&&        27& 57&&       34& 65&&         46& 63&&       ~37& ~67\\
Total (mean wtrp)               &&63 & 193&&       27& 41&&        31& 62&&       42& 68&&         83& 82&&       211& 207\\
\hline
\end{tabular}
\end{table}