\begin{table}%t4
  \caption{\label{Tab:DIpar}Reconstruction parameters adopted for DI.}
  %\centerline
{\small
  \begin{tabular}{l c}
      \hline \hline
      Parameter \hspace*{3.5cm} & Value \\
      \hline
      Differential rotation $\alpha$                     & 0. \\
      Limb darkening $\epsilon$                          & 0.6--0.8 \\
      Macro-turbulence$^a$  
                                                         & 2/12 ${\rm km} ~ {\rm s}^{-1}$ \\
      Contrast photosphere/spot                          & 0.5 \\
      $n_T$$^b$
                                                         & 4 \\
      \hline
    \end{tabular}}
\par
\medskip
$^a$~Probably unphysical since mainly used for line profile adjustments.
$^b$~Number of intensity levels between darkest and brightest surface elements (``surface temperatures'').
\end{table}