\begin{table}%t4
\par
\caption{\label{tab4} Astrometric data.}
%\centerline
{
\begin{tabular}{ccrrrrrrrrrrrrrrcrr}
\hline
\hline
\omit &\omit &\multicolumn{5}{c}{Single-image} &\omit &\multicolumn{9}{c}{Mosaic} \\ 
\cline{3-7}
\cline{9-19}
%\vspace{0.01cm}
\\
\omit &\omit &\omit &\omit &\omit &\omit &  
\omit &\omit &\omit &\omit & 
\omit &\omit &\omit &\omit &\omit &\multicolumn{2}{c}{\hskip -8pt {\tiny \hskip 10pt $<({\rm O{-}C})^{2}>^{\frac{1}{2}}$}} &\omit &\omit  \\
%\vspace{0.002cm}
\\
\cline{16-17}
\vspace{0.01cm}\\
ICRF  & MJD & 
$\Delta\alpha*$ &  $\sigma_{\alpha*}$ & $\Delta\delta$ & $\sigma_{\delta}$ & $N$ & &  
$\Delta\alpha*$ &  $\sigma_{\alpha*}$ & $\Delta\delta$ & $\sigma_{\delta}$ & $N$ & 
$c_{\alpha*}$   &  $c_{\delta}$       & $\alpha*$      & $\delta$ & $r_{\alpha}$ & $r_{\delta}$\\
name \\
\cline{3-6}
\cline{9-12}
\cline{14-17}
\vspace{-0.3cm}\\
\multicolumn{2}{c}{} & \multicolumn{3}{c}{mas} & \multicolumn{1}{c}{} & \multicolumn{7}{c}{mas} & \multicolumn{4}{c}{mas} \\
\vspace{-0.3cm}\\
\hline
0312$-$770 & 52~648.02 &   $-$5 & 37 &	  54 & 37 &  5 &&  $-$41 & 18 &     11 & 23 &  10 & 53 & 91 & 58 & 33 &  1.18 & 0.72\\
0528$-$250 & 52~649.04 &   $-$4 & 17 &	$-$4 & 17 &  6 &&      4 & 11 &  $-$11 & 10 &  14 & 31 & 20 & 20 & 35 &  0.53 & 1.00\\
0537$-$286 & 52~650.07 &     35 & 18 &	  14 & 16 &  7 &&     28 & 13 &     31 & 12 &  11 & 26 & 23 & 47 & 36 &  1.18 & 0.92\\
0629$-$418 & 52~649.11 &     38 & 39 &	  31 & 33 &  4 &&     30 &  9 &   $-$4 &  9 &  20 & 40 & 25 & 37 & 26 &  0.97 & 0.67\\    
0646$-$306 & 52~648.09 & $-$132 & 26 &	   8 & 26 &  6 &&  $-$44 &  7 &      9 &  6 &  31 & 35 & 36 & 35 & 33 &  1.00 & 1.03\\
0700$-$465 & 52~649.15 &     21 & 24 &  $-$17 & 23 &  9 &&   $-$3 & 11 &   $-$1 &  9 &  23 & 38 & 27 & 46 & 33 &  0.92 & 0.80\\  
0700$-$465 & 52~650.19 &     18 & 18 &	$-$3 & 18 & 10 &&      8 & 12 &   $-$1 & 11 &  22 & 26 & 27 & 57 & 61 &  1.00 & 1.17\\
0743$-$673 & 52~648.17 &    128 & 22 &  $-$45 & 27 &  8 &&    112 & 13 &     23 & 14 &  19 & 29 & 31 & 44 & 38 &  0.81 & 0.63\\    
0823$-$223 & 52~649.18 &  $-$31 & 22 &	  48 & 22 & 18 &&  $-$28 &  9 &     25 & 10 &  46 & 26 & 28 & 57 & 69 &  0.90 & 1.06\\    
1101$-$536 & 52~648.22 &     46 & 11 &	  17 & 11 & 27 &&     33 &  6 &     36 &  6 &  81 & 25 & 21 & 46 & 73 &  0.96 & 1.46\\    
1104$-$445 & 52~648.25 &  $-$42 & 34 &	  25 & 38 &  7 &&      8 &  8 &      9 &  8 &  32 & 30 & 23 & 49 & 53 &  1.11 & 1.26\\ 
1105$-$680 & 52~648.28 &     32 &  8 &	  29 &  8 & 33 &&     25 &  5 &      4 &  5 &  88 & 27 & 27 & 67 & 54 &  1.46 & 1.20\\    
1116$-$462 & 52~648.32 &     46 & 22 &  $-$52 & 22 &  9 &&     22 &  7 &  $-$42 &  7 &  42 & 25 & 25 & 39 & 53 &  0.93 & 1.23\\  				 1116$-$462 & 52~650.35 &     40 & 21 &  $-$28 & 21 & 13 &&     18 &  7 &  $-$26 &  7 &  42 & 26 & 30 & 45 & 51 &  1.07 & 1.19\\
1129$-$580 & 52~649.33 &  $-$43 & 13 &	  33 & 13 & 22 &&  $-$30 &  4 &     14 &  4 & 131 & 30 & 26 & 54 & 56 &  1.10 & 1.10\\
1144$-$379 & 52~649.29 &     12 & 30 &  $-$29 & 27 &  6 &&     28 & 13 &  $-$51 & 11 &  16 & 30 & 29 & 39 & 43 &  0.76 & 1.02\\    
\hline                                            
\end{tabular}}
\smallskip
All positional derived data are given in milliarcseconds [mas]. All ICRF positions are taken 
from \citet{cma}. $\alpha*$~stands for $\alpha{\rm cos}~\delta$. 
Only results in the $F$~filter are concerned. Column~1:~ICRF~quasar 
identification; Col.~2:~Modified Julian Date of the observation; Cols.~3 
and~5:~positional differences from the astrometric analysis of the single 
central image, in the sense near-IR minus~ICRF, in right ascension and 
declination, respectively; Cols.~4 and~6:~precisions from the astrometric analysis of 
the single central image, of the observed near-IR positions of the ICRF quasars, in right 
ascension and declination, respectively; Col.~7: number of reference (UCAC2) stars used in the astrometric analysis of 
the single central images; Cols.~8 and~10:~positional differences from the reduction in astrometry mode, in the sense near-IR minus ICRF, in right 
ascension and declination, respectively;
Cols.~9 and~11: precisions of the observed near-IR positions in the astrometry mode of the ICRF~quasars in right ascension and declination, 
respectively; Col.~12:~number of reference (UCAC2) stars used in the astrometry mode; Cols.~13 and~14:~internal precision as obtained from the positions of stars in overlapping regions, in right ascension and 
declination, respectively; Cols.~15 and~16:~rms of the differences observed minus calculated to the reference (UCAC2) stars in the astrometry mode at the epoch of the 
observations, in right ascension and declination, respectively; Cols.~17 and~18:~ratio between the values provided by Cols.~15 and~16 and the respective 
nominal standard deviations propagated to the epoch of the observations for the reference stars, in right ascension and declination, respectively.
\end{table}