\begin{table}%t7
\par
  \caption {\label{tab:mc}Comparaison of the predicted error bar and the root mean squared error measured on 100~Monte Carlo realisations of EPIC-CS observation.}
$$
  \begin{array}{cccc}
    \hline
    \hline
    r & \langle r \rangle^{{a}} & \langle \sigma_r^{\rm FISHER} \rangle^{{a}} & \sigma_r^{\rm MC} \\
    \hline
    0.01 & 9.91 \times 10^{-3} & 3.59 \times 10^{-4} & 3.49 \times 10^{-4} \\
    0.001 & 1.05 \times 10^{-3} & 1.84 \times 10^{-4} & 1.84 \times 10^{-4} \\
    \hline
  \end{array}
  $$
\end{table}