\begin{table}%t13
\caption{\label{tab:sepPola}Contrasts  and  phase-shifts  obtained when the splitting of polarizations  is done before or after the combination, and when no splitting is achieved. Errors are statistical.}
%\centering
\small
    \begin{tabular}{c|c c c c }
      \hline
      \hline
%&&&& \\[-8pt]
      Pixel & $12^{1}$ & $12^{2}$ & $12^{3}$ & $12^{4}$\\
      \hline 
      $\langle V \rangle$ before & 83.7 $\pm$ 0.3 & 83.6 $\pm$ 0.3 & 81.3 $\pm$ 0.3 & 81.7 $\pm$ 0.3 \\
\par
      $\langle V \rangle$ after & 79.6 $\pm$ 0.2 & 79.4 $\pm$ 0.2 & 78.2 $\pm$ 0.2 & 77.2 $\pm$ 0.2 \\
\par
      $\langle V \rangle$ $\varnothing$ & 71.3 $\pm$ 0.5 & 71.2 $\pm$ 0.5 & 66.7 $\pm$ 0.5& 66.9 $\pm$ 0.5 \\
\hline
\end{tabular}
  \\[-1.4pt]
    \begin{tabular}{c|c c c }
      Polar splitting & Before & After & $\varnothing$\\
      \hline
      Phase-shifts &  78.98 $\pm$ 0.03 & 79.80 $\pm$ 0.08 & 76.12 $\pm$ 0.07\\
\hline
    \end{tabular}
\end{table}