\begin{table}%t6
%%\centering

\par
\caption{\label{table:radius_real}Radius and fitted parameters for real data from stellar modelling (package RadEx).}
\begin{tabular}{lcccccccc}
\hline\hline \noalign{\smallskip}
Star &$R_{F}$ ($R_\odot$)&$\sigma(R)$ ($R_\odot$)&  &  $T_{eff, F}$ (K)&  &
$\langle\Delta\nu\rangle_{\rm F}$ ($\mu$Hz)& $\langle\Delta\nu\rangle_{\rm O}$ ($\mu$Hz)& $\epsilon_{\langle\Delta\nu\rangle_{\rm Obs}}$  ($\mu$Hz)\\
\hline
Sun &1.016 &0.023 &      &5879 &     &135.46 &134.67 & 3.26\\
HD49933 &1.398 &0.040 &      &6835 &     & 86.14 & 84.60 & 1.58\\
HD181420 &1.613 &0.032 &      &6596 &     & 75.35 & 76.43 & 1.53\\
HD181906 &1.420 &0.018 &  &6294 &   & 86.53 & 86.12 & 1.69\\
\hline 
\end{tabular}
\tablefoot{F~=~fitted; O~=~Observed.}
\end{table}