\begin{table}%t1
%%\centering
\par
\caption{\label{tab1}Revised and new eclipse times of NN~Ser~ab with residuals
for the light-travel-time effect produced by the two planets of Model~2a\tablefootmark{1}.}
\begin{tabular}{ccccc}
\hline \hline\noalign{\smallskip}
E & BJD(TT) & \multicolumn{2}{c}{\hspace{-3mm}Error} & Residual  \\
& JD2450000$+$&(days) & (s)  & (s) \\ 
\hline
\multicolumn{5}{l}{{(a) Revised, VLT $V$-band and Wroclaw Obs. white light:}}\\ 
30721 & 1340.7165402 & 0.0000023 & 0.20  &  $-$0.03 \\
33233 & 1667.4780058  & 0.0000960  & 8.29  & \hspace{2.1mm}0.35 \\ 
\multicolumn{5}{l}{{(b) MONET/North 1.2-m white light photometry:}}\\ 
60489 & 5212.9418187 & 0.0000069 &  0.60  & \hspace{2.1mm}0.23\\ 
60505 & 5215.0230961 & 0.0000066 & 0.57& $-$0.15 \\ 
60528 & 5218.0149380 & 0.0000043 & 0.37& $-$0.21 \\ 
60735 & 5244.9415254 & 0.0000029 &  0.25  & \hspace{2.1mm}0.10\\ 
60743 & 5245.9821654 & 0.0000032 &  0.28  & \hspace{2.1mm}0.03\\ 
60751 & 5247.0228063 & 0.0000034 &  0.29  & \hspace{2.1mm}0.02\\ 
60774 & 5250.0146469 & 0.0000034 & 0.29  & $-$0.16 \\ 
\multicolumn{5}{l}{{(c) McDonald 2.1-m photometry with Schott $BG40$ filter:}}\\ 
60927 & 5269.9169047 & 0.0000014 & 0.12 & $-$0.16 \\ 
60950 & 5272.9087487 & 0.0000013 & 0.11 & $-$0.04 \\ 
61426 & 5334.8268834 & 0.0000018 & 0.16 & $-$0.22\\
61440 & 5336.6480059 & 0.0000018 & 0.16 & $-$0.15\\
61441 & 5336.7780894 & 0.0000015 &  0.13&  \hspace{2.1mm}0.15 \\
61564 & 5352.7779443 & 0.0000016 &  0.14&  \hspace{2.1mm}0.15 \\ 
\multicolumn{5}{l}{{(c) ESO NTT 3.5-m ULTRACAM Sloan $g'$ photometry:}}\\[0.5ex]
61219 & 5307.9003015 & 0.0000010 &  0.09  &\hspace{2.1mm} 0.04 \\ 
61579 & 5354.7291448 & 0.0000009 &  0.08  &\hspace{2.1mm} 0.03 \\ 
\hline 
\end{tabular}
\tablefoot{\tablefoottext{1}{Table~\ref{tab3} in the electronic version of the journal provides a list of all eclipse times used in this work.}}
\end{table}