\begin{table}%t1
\caption{\label{tab : notations}Table of the notations.}
%\centerline
 {\small \begin{tabular}{lc}
\hline\hline
          Wavelength & $\lambda$\\
         % \hline
          Central wavelength & $\lambda_0$\\
          %\hline
          Bandwidth & $1/R_\lambda = \Delta\lambda/\lambda_0$\\
         % \hline
          Star flux in the pupil upstream of the coronagraph & $\psi_0$\\
         % \hline
          Pupil diameter  in the image channel & $D$\\
         % \hline
          Pupil diameter  in the reference channel & $D_{{\rm R}}$\\
         % \hline
          $D/D_{{\rm R}}$ & $\gamma$\\
         % \hline
          Flat pupil of diameter~$D$~($1$ inside, $0$ outside) & $P$\\
         % \hline
          Pupil coordinate & $\xi$\\
         % \hline
          Phase aberrations upstream the coronagraph & $\phi_\lambda(\xi)$\\
        %  \hline
          Amplitude aberrations upstream the coronagraph & $a(\xi)$\\
        %  \hline
Pupil star amplitude in the image channel & $\psi_{{\rm S},\lambda}(\xi)$\\
        %  \hline
          Pupil star amplitude in the reference channel & $\psi_{{\rm R},\lambda}(\xi)$\\
        %  \hline
          Pupil separation & $\xi_0$\\
        %  \hline
          Focal plane angular coordinate & $\alpha$\\
        %  \hline
           Amplitude in the detector plane for $\lambda$ & $A_{i,\lambda}(\alpha)$\\
       %   \hline
          Intensity in the detector plane for $\lambda$ & $I_{i,\lambda}(\alpha)$\\
        %  \hline
          Polychromatic intensity in the detector plane & $I_{i}(\alpha)$\\
       %   \hline
Number of actuators of the deformable mirror & $N_{\rm act}$~x~$N_{\rm act}$\\
       %\hline
            Interferential image in the detector plane  & $I(\alpha)$\\
             % \hline
          Estimation of $I_{{\rm R}}(\alpha)$ & $\overline{I}_{{\rm R}}(\alpha)$\\
           % \hline
            Estimation of $A_{{\rm R}}(\alpha)$ & $\overline{A}_{{\rm R}}(\alpha)$\\
            \hline
        \end{tabular}}
\medskip
Index~$i$ represents~${\rm R}$, ${\rm S}$, or~${\rm C}$ referring to the reference channel, the stellar residue of the image channel and the companion light of the image channel.   
\end{table}