\begin{table}%t7
\caption{\label{tab:coupl}Coupler splitting ratio.  The dispersion (rms) over 1024~measurements is~0.2\%. The two first lines correspond to the wide band experiments  while the  third gives the  average value  and the variation amplitude over the wavelength range.}  
\par
%\centering
\small
\begin{tabular}{c|c c  c c  c c  c c  c c  c c }
\hline
\hline
%&&&&&&&&&&&& \\[-8pt]
 C&  C$_{12}^{1}$  &  C$_{12}^{2}$  &  C$_{13}^{1}$  &  C$_{13}^{2}$  &
 C$_{14}^{1}$ & C$_{14}^{2}$& C$_{24}^{1}$ & C$_{24}^{2}$ & C$_{23}^{1}$ & C$_{23}^{2}$ & C$_{34}^{1}$ & C$_{34}^{2}$\\
%&&&&&&&&&&&& \\[-8pt]
 \hline
 Chip 1 & 54.1 & 59.6& 50.5 & 58.4 & 59.7 & 61.5 & 57.5 & 58.5 & 48.3 & 50.4 & 53.9 & 55.2\\
 Chip 2 & 52.0 & 58.9 & 55.2 & 55.7 & 58.3 & 56.3 & 56.3 & 51.2 & 52.6 &55.0 & 55.0 & 55.4 \\ 
avg/$\Delta  \lambda$ & 53.9/5.4 & 53.9/4.1 &  55.6/4.5 & 57.2/5.7 &
56.0/6.1  & 60.0/5.8 &  56.0/3.1 &  56.5/5.4 &  54.8/7.0 &  47.6/5.0 &
47.2/5.0 & 54.1/7.2 \\ 
\hline
\end{tabular}
\end{table}