\begin{table}%t6
\caption{\label{tab:jY}$Y$-junction splitting ratio. The dispersion (rms) over 1024~measurements is~0.1\%. 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]
 $Y$&  $Y_{12}^{1}$  &  $Y_{12}^{2}$  &  $Y_{13}^{1}$  &  $Y_{13}^{2}$  &
 $Y_{14}^{1}$ & $Y_{14}^{2}$& $Y_{24}^{1}$ & $Y_{24}^{2}$ & $Y_{23}^{1}$ & $Y_{23}^{2}$ & $Y_{34}^{1}$ & $Y_{34}^{2}$\\
%&&&&&&&&&&&& \\[-8pt]
 \hline
 Chip 1 & 52.5 & 47.4 & 47.0 & 44.4 & 50.2 & 50.2 & 52.6 & 50.0 &
 51.5 & 52.6  & 54.7  & 51.0  \\
 Chip 2 & 48.7 & 45.7 & 52.2 & 49.8 & 51.2 & 50.5 & 54.1 & 50.4 & 53.0 & 53.2 & 52.2 & 50.3 \\
 avg/$\Delta \lambda$ & 52.1/4.0  & 46.6/6.0 & 52.0/5.7 & 48.8/8.0 &
 49.7/7.5 & 49.3/7.4  & 51.6/3.7 & 49.3/4.2 &  49.5/28.0 & 50.1/25.9 &
 49.5/4.5 & 46.5/6.2 \\ 
\hline
\end{tabular}
\end{table}