\begin{table}%t2
\caption{\label{tab2}Photometric data.} 
%\centerline
{
\begin{tabular}{cccccccccccccccccccc}
\hline
\hline
& & & &  \multicolumn{3}{c}{Literature data} & & & & & & &  \multicolumn{4}{c}{Observational data } & & & \\ 
\cline{1-10}
\cline{12-20}
& & & & & & & & & & & &\multicolumn{3}{c}{Magnitude} &  \multicolumn{3}{c}{Flux}  & & \\ 
\cline{13-15}
\cline{16-18} 
ICRF  & c    & {\it z}    &  6 cm    & $\alpha_{\rm R}$   &    Type & $M_{B}$ & $B$   &    $V$   &  $R$ &  IntID & MJD  & $J$ & $H$ & $K_{\rm s}$  & $J$ & $H$ & $K_{\rm s}$ & $\alpha$ & $\sigma_{\alpha}$ \\
name \\
\hline
0312$-$770 & C &    0.223   &	 0.56  &       0.3     & Gal     & $-$24.5 & 15.93 &	16.1  & 15.3 & 01a & 52~648.02 & 14.67 & 14.04 & 13.06 & 2.22 &  2.55 &  3.97 & \sb$-$1.05 & 0.26 \\
0431$-$512 & C &    0.557   &	 0.59  & \sb$-$0.3     & Quasar  & $-$24.7 & 17.43 &	18.0  & 18.4 & 03p & 52~649.02 & 16.88 & 16.03 & 15.17 & 0.29 &  0.40 &  0.57 & \sb$-$1.23 & 0.01 \\
0511$-$220 & C &    1.296   &	 0.87  &       0.1     & Quasar  & $-$25.4 & 19.34 &	19.5  & 19.6 & 04p & 52~650.05 & 18.83 & 17.72 & 17.04 & 0.05 &  0.09 &  0.10 & \sb$-$1.27 & 0.01 \\
0521$-$365 & D &    0.055   &	 8.89  & \sb$-$0.5     & BL Lac  &     -- & 12.15 &	14.6  & 11.4 & 07p & 52~650.03 & 13.10 & 12.30 & 11.54 & 9.40 & 12.60 & 16.14 & \sb$-$0.98 & 0.12 \\
0530$-$727 & D &     --    &	 --   &       --     & --	 &     -- & 18.85 &	--   & 18.0 & 08p & 52~648.05 & 16.39 & 15.41 & 14.47 & 0.46 &  0.72 &  1.08 & \sb$-$1.55 & 0.01 \\
0528$-$250 & O &    2.765   &	 0.85  & \sb$-$0.2     & Quasar  & $-$29.0 & 18.01 &	17.3  & 17.3 & 09a & 52~649.04 & 16.09 & 15.71 & 15.39 & 0.60 &  0.55 &  0.47 &      0.44 & 0.01 \\
0537$-$286 & D &    3.104   &	 1.23  &       0.5     & Quasar  & $-$27.7 & 19.72 &	20.0  & 19.0 & 10a & 52~650.07 & 17.76 & 16.94 & 16.24 & 0.13 &  0.18 &  0.21 & \sb$-$0.87 & 0.01 \\
0614$-$349 & C &     --    &	 --   & \sb$-$0.6     & Other	 &     -- & 19.98 &    18.0  & 16.8 & 11p & 52~649.10 & 17.67 & 16.84 & 16.07 & 0.14 &  0.19 &  0.25 & \sb$-$1.05 & 0.00 \\   
0622$-$441 & C &    0.688   &	 0.89  &       0.2     & Quasar  & $-$26.1 & 16.36 &	16.9  & 16.7 & 13p & 52~650.10 & 15.81 & 15.09 & 14.28 & 0.78 &  0.97 &  1.30 & \sb$-$0.93 & 0.03 \\
0629$-$418 & D &    1.416   &	 0.74  &       0.5     & Quasar  & $-$26.0 & 18.18 &	19.3  & 18.2 & 14a & 52~649.11 & 17.55 & 16.72 & 16.41 & 0.16 &  0.22 &  0.18 & \sb$-$0.22 & 0.03 \\   0637$-$752 & D &    0.654   &	 6.19  & \sb$-$0.1     & Gal     & $-$27.0 & 16.00 &	15.8  & 15.8 & 15p & 52~650.12 & 14.82 & 14.31 & 13.60 & 1.92 &  1.98 &  2.43 & \sb$-$0.43 & 0.11 \\
0646$-$306 & C &    0.455   & \ss1.06* &       0.2     & Quasar  & $-$24.2 & 19.10 & \ss20.4* & 18.8 & 17a & 52~648.09 & 16.90 & 15.93 & 15.02 & 0.28 &  0.44 &  0.66 & \sb$-$1.56 & 0.00 \\
0700$-$465 & C & \ss0.822*  & \ss0.64* &       0.3     & --     & $-$24.3 & 18.57 & \ss19.5* & 19.4 & 19a & 52~649.15 & 15.67 & 14.82 & 13.94 & 0.88 &  1.23 &  1.76 & \sb$-$1.26 & 0.02 \\  
0700$-$465 & C & \ss0.822*  & \ss0.64* &       0.3     & --     & $-$24.3 & 18.57 & \ss19.5* & 19.4 & 19a & 52~650.19 & 16.10 & 15.27 & 14.36 & 0.59 &  0.82 &  1.20 & \sb$-$1.29 & 0.02 \\
0743$-$673 & C &    1.510   &	 1.96  & \sb$-$1.0     & Quasar  & $-$28.6 & 16.15 &	16.4  & 15.9 & 23a & 52~648.17 & 14.94 & 14.30 & 14.10 & 1.72 &  2.00 &  1.53 &      0.21 & 0.22 \\    0809$-$493 & C &     --    &	 --   & \sb$-$0.3     & --	 &     -- & 21.40 &	--   &  -- & 24p & 52~650.30 & 19.29 & 18.32 & 17.28 & 0.03 &  0.05 &  0.08 & \sb$-$1.78 & 0.00 \\    0823$-$500 & C &     --    &	 --   &       --     & --	 &     -- &  --  &	--   &  -- & 25p & 52~648.20 & 18.14 & 17.06 & 16.30 & 0.09 &  0.16 &  0.20 & \sb$-$1.46 & 0.02 \\
0823$-$223 & C & \sb$>$0.910&	 0.78  &       0.5     & BL Lac  &     -- & 15.88 &	16.2  & 15.8 & 26a & 52~649.18 & 14.22 & 13.31 & 12.47 & 3.35 &  4.98 &  6.87 & \sb$-$1.31 & 0.09 \\	
0834$-$201 & D &    2.752   &	 3.42  & \sb$-$0.3     & Quasar  & $-$27.9 & 19.09 &	19.4  & 18.8 & 30p & 52~650.23 & 17.30 & 16.78 & 16.27 & 0.20 &  0.20 &  0.21 & \sb$-$0.09 & 0.00 \\  0842$-$754 & C &    0.524   &	 1.38  & \sb$-$0.7     & Gal     & $-$24.2 & 18.03 &	18.9  & 17.0 & 31p & 52~650.32 & 16.76 & 15.94 & 15.16 & 0.32 &  0.44 &  0.58 & \sb$-$1.08 & 0.00 \\  0919$-$260 & O &    2.300   &	 2.38  &       0.2     & Quasar  & $-$27.7 & 18.63 &	18.4  & 18.0 & 32p & 52~650.24 & 16.45 & 15.89 & 15.16 & 0.43 &  0.46 &  0.58 & \sb$-$0.54 & 0.02 \\ 
0920$-$397 & C &    0.591   &	 1.51  & \sb$-$0.2     & Quasar  & $-$24.4 & 18.54 &	18.8  & 17.7 & 33p & 52~649.23 & 16.02 & 15.23 & 14.49 & 0.64 &  0.85 &  1.07 & \sb$-$0.94 & 0.01 \\
0925$-$203 & C &    0.348   &	 0.69  & \sb$-$0.2     & Gal     & $-$25.3 & 16.34 &	16.4  & 16.0 & 34p & 52~649.21 & 15.48 & 14.74 & 14.02 & 1.04 &  1.33 &  1.64 & \sb$-$0.83 & 0.01 \\
1048$-$313 & C & \ss1.429*  & \ss1.02* & \sb$-$0.1     & --     & $-$25.7 &  --  & \ss19.4* &  -- & 38p & 52~649.25 & 18.29 & 17.43 & 16.88 & 0.08 &  0.11 &  0.12 & \sb$-$0.74 & 0.01 \\ 
1101$-$325 & C &    0.354   &	 0.73  & \sb$-$0.4     & Gal     & $-$25.5 & 17.11 &	16.3  & 15.5 & 39p & 52~649.27 & 14.74 & 14.09 & 13.18 & 2.07 &  2.43 &  3.57 & \sb$-$0.99 & 0.18 \\  1101$-$536 & C &     --    &	 --   &       --     & Quasar  &     -- & 17.82 &    17.9  & 16.4 & 40a & 52~648.22 & 14.84 & 13.83 & 12.82 & 1.90 &  3.09 &  4.96 & \sb$-$1.74 & 0.01 \\   
1104$-$445 & O &    1.598   &	 2.03  &       0.1     & Quasar  & $-$26.8 & 17.45 &	18.2  & 17.4 & 41a & 52~648.25 & 16.20 & 15.39 & 15.07 & 0.54 &  0.73 &  0.62 & \sb$-$0.26 & 0.09 \\ 
1105$-$680 & C &    0.588   &	 1.37  &       0.3     & Quasar  & $-$23.6 & 17.89 &	18.4  & 17.9 & 42a & 52~648.28 & 16.24 & 15.50 & 14.77 & 0.52 &  0.66 &  0.82 & \sb$-$0.83 & 0.00 \\	
1116$-$462 & C &    0.713   &	 1.31  & \sb$-$0.4     & Quasar  & $-$26.0 & 17.25 &	17.0  & 16.5 & 43a & 52~648.32 & 15.79 & 15.41 & 14.55 & 0.79 &  0.72 &  1.01 & \sb$-$0.44 & 0.10 \\  1116$-$462 & C &    0.713   &	 1.31  & \sb$-$0.4     & Quasar  & $-$26.0 & 17.25 &	17.0  & 16.5 & 43a & 52~650.35 & 15.81 & 15.40 & 14.51 & 0.77 &  0.72 &  1.05 & \sb$-$0.56 & 0.11 \\
1129$-$580 & C &     --    &	 --   &       --     & --	 &     -- & 18.92 &	--   & 17.7 & 44a & 52~649.33 & 15.73 & 15.01 & 14.39 & 0.83 &  1.04 &  1.17 & \sb$-$0.63 & 0.03 \\ 
1144$-$379 & C &    1.048   &	 2.22  & \sb$-$0.2     & BL Lac  & $-$27.7 & 17.23 &	16.2  & 16.7 & 46a & 52~649.29 & 15.97 & 15.14 & 14.14 & 0.67 &  0.92 &  1.47 & \sb$-$1.43 & 0.05 \\  \hline
\end{tabular}}
\smallskip
Column 1: ICRF quasar identification; Col.~2: source category in the ICRF: Defining, Candidate or Other; 
Col.~3: redshift as given either by \citet{tnt} or by the Veron-Cetty \& Veron catalogue
\citep{ver}~(*); Col.~4: flux [Jy] at 6~cm as given either by \citet{tnt}  or by the Veron-Cetty \& Veron 
catalogue~(*); Col.~5: radio spectral index as given by \citet{tnt}; Col.~6: object type as given by \citet{tnt}; Col.~7: absolute $B$ magnitude as given by the Veron-Cetty \& Veron catalogue; Col.~8: $B$ magnitude 
as given by the USNOB-1 catalogue \citep{mon}; Col.~9: $V$ magnitude as given either by \citet{tnt} or by 
the Veron-Cetty \& Veron catalogue~(*); Col.~10: $R$~magnitude as given by the USNOB-1 catalogue; 
Col.~11: internal identification -- "p'' for photometry mode, and "a'' for astrometry mode; Col.~12: 
Modified Julian Date of the observation; Cols.~13$-$15: Observed $J$, $H$, and $K_{\rm s}$~magnitudes, 
respectively; Cols.~16--18: observed fluxes [mJy] in the $J$, $H$, and $K_{\rm s}$~filters, 
respectively; Col.~19: near-IR spectral indices, as derived from the observations in the $J$, $H$, and 
$K_{\rm s}$~filters; Col.~20: uncertainties of the spectral indices given by the preceding column.
\end{table}