\begin{table}%t8
\caption{\label{tab:ct}Cross-talk flux (in~\%) determined when the light is injected in the 4~outputs successively. The two first lines report  results obtained  in  broad band  while  the third  line corresponds to the spectral dispersion case.  Error bars are estimated from the dispersion~(rms).}  
%\centering
\small
\begin{tabular}{c|c c c c} 
       \hline
       \hline
       Day & Injection in 1 & Injection in 2 & Injection in 3 & Injection in 4 \\
       \hline
       Chip 1 & 0.7 $\pm$ 0.2 & 0.6 $\pm$ 0.2 & 1.2 $\pm$ 0.4 & 1.1 $\pm$ 0.3\\
\par
       Chip 2 & 0.4 $\pm$ 0.2 & 0.3 $\pm$ 0.2 & 0.3 $\pm$ 0.2 & 0.2 $\pm$ 0.2 \\
\par
       avg/$\Delta \lambda$ & 0.3/0.03 & 0.4/0.03 & 0.9/1.5 & 0.5/0.6\\
\hline
\end{tabular}
\end{table}