\begin{table}%t9
\caption{\label{tab:c}Instrumental contrasts (in~\%) obtained with wide band experiments (first  two lines)  and with spectral  dispersion (third line) with a statistical error of~1\%.}  
%\centering
\small
\begin{tabular}{c|c c c c  c c  c c c c  c c }
\hline
\hline
%&&&&&&&&&&&& \\[-8pt]
Output &  $12^{1}$ & $12^{2}$ & $12^{3}$  & $12^{4}$ &
$23^{1}$   &  $23^{2}$   &  $13^{1}$   &   $13^{2}$  &
$13^{3}$ & $13^{4}$ &  $14^{1}$ &  $14^{2}$ \\
%&&&&&&&&&&&& \\[-8pt]
\hline
Chip 1 & 95 $\pm$ 1 & 97 $\pm$ 1 & 95 $\pm$ 1 & 98 $\pm$ 1 & 96 $\pm$ 1 & 97 $\pm$ 1 &94 $\pm$ 1 & 96 $\pm$ 1 & 94 $\pm$ 1 & 95 $\pm$ 1 & 96 $\pm$ 1 & 98 $\pm$ 1\\ 
Chip 2 & 90 $\pm$ 2 & 90 $\pm$ 2 & 92 $\pm$ 2 & 88 $\pm$ 3 & 85 $\pm$ 3 & 93 $\pm$ 2 & 83 $\pm$ 5 & 88 $\pm$ 4 & 85 $\pm$ 4 & 88 $\pm$ 3 & 88 $\pm$ 4 & 94 $\pm$ 1 \\
avg/$\Delta \lambda$ & 99/2.7 & 100/2.1 & 99/2.6 & 100/1.8 & 98/3.3 & 99/3.8 & 97/1.0 & 97/1.3 & 97/0.8 & 97/1.4 & 97/1.3 & 97/1.6 \\
\hline
\end{tabular}
\\[-1.4pt]
\begin{tabular}{c|c c  c c c c  c c  c c c c}
%&&&&&&&&&&&& \\[-8pt]
Output &  $14^{3}$ &  $14^{4}$ &  $24^{1}$  &  $24^{2}$ &
$24^{3}$ &  $24^{4}$ & $23^{3}$ & $23^{4}$ &  $34^{1}$ &  $34^{2}$ &  $34^{3}$ &  $34^{4}$ \\
%&&&&&&&&&&&& \\[-8pt]
\hline
Chip 1 & 97 $\pm$ 1 & 97 $\pm$ 1 & 96 $\pm$ 1 & 97 $\pm$ 1 & 97 $\pm$ 1 & 97 $\pm$ 1 & 97 $\pm$ 1 & 97 $\pm$ 1 & 96 $\pm$ 1 & 97 $\pm$ 1 & 97 $\pm$ 1& 96 $\pm$ 1\\
Chip 2 & 88 $\pm$ 4 & 93 $\pm$ 1 & 84 $\pm$ 4 & 93 $\pm$ 2 & 88 $\pm$ 3 & 91 $\pm$ 2 & 86 $\pm$ 4 & 92 $\pm$ 2 & 82 $\pm$ 6 & 88 $\pm$ 3 & 83 $\pm$ 8 & 84 $\pm$ 3\\
avg/$\Delta \lambda$ & 97/1.2 & 97/1.5 & 100/2.5 & 98/2.4 &
99/2.2 & 97/2.4 & 98/1.1 & 99/2.6 & 97/3.0 & 97/4.1 & 97/3.5 &   97/4.6 \\
\hline
\end{tabular}
\end{table}