\begin{table}%t1
  \caption{Limb-darkening coefficients used for the transit fitting, taken 
from Claret (\cite{Claret2004}) for a star with metallicity $\rm [Fe/H]=0.0$,
surface gravity $\log~g=4.5$, and effective temperature $T_{\rm eff}=7000$~K.}
%\centering
\par
\small
  \begin{tabular}{ccc} \hline\hline
  Filter  & $\gamma_1$ & $\gamma_2$  \\ \hline
  $g'$      & 0.3395     & 0.3772      \\ 
  $r'$      & 0.2071     & 0.3956      \\ 
  $i'$      & 0.1421     & 0.3792      \\ 
  $z'$      & 0.0934     & 0.3682      \\ \hline
  \end{tabular}
  \label{limb} 
\end{table}