\begin{table}%t1
  %\centering
\par
  \caption{\label{optics}Definition of the active optical elements in FLASH ($f$ is the focal
    length, $e$ the eccentricity, and $c$ the linear eccentricity of the
    individual mirror).}
    \begin{tabular}{l l r r r}\hline\hline
      Name & Type & $f$ [mm] & $e$ & $c$ [mm]\\\hline
      M1 & elliptic & 833.0 &0.71& 1190.4 \\
      M2 & hyperbolic & 383.0 &2.0 & 435.9 \\
      P460 & parabolic & 20.74 & 1.0 & $\infty$ \\
      P810 & parabolic & 17.29 & 1.0 & $\infty$ \\\hline
    \end{tabular}
\par
\end{table}