\begin{table}%t3
\caption{Magnitude and colour photometric errors as a function of $V$.}\label{errors}
%\centering
\par
\begin{tabular}{ccccc}
\hline\hline
$\Delta$$V$ & $\sigma$$V$ & $\sigma$($V-I$) & $\sigma$$T_1$ & 
$\sigma$($C-T_1$) \\
   (mag)    &    (mag)    &     (mag)     &     (mag)     &    (mag)   \\
\hline
12--13       &  0.004      &    0.012      &     0.010     &     0.010 \\
13--14       &  0.005      &    0.013      &     0.011     &     0.013 \\
14--15       &  0.006      &    0.015      &     0.012     &     0.020 \\
15--16       &  0.008      &    0.018      &     0.020     &     0.021 \\
16--17       &  0.013      &    0.025      &     0.050     &     0.055 \\
17--18       &  0.019      &    0.040      &     0.100     &     0.100 \\
18--19       &  0.035      &    0.075      &     0.240     &     0.290 \\
19--20       &  0.075      &    0.130      &     --       &     -- \\
20--21       &  0.150      &    0.250      &     --       &     -- \\
\hline
\end{tabular}
\end{table}