\begin{table}%T2
\par
\caption{\label{tabella2}Radii estimated with the two different approximations , 
i.e  with and without the~$\Delta B$ term (respectively Cols.~2,~3),  using model predictions (Col.~4), and from modified synthetic curves in the case of good (Col.~5) and fair (Col.~6) data respectively. }
%\centering
\par
\begin{tabular}{cccccc}
\hline
\hline 
Models&$R_{{\rm without} \Delta B}$&$R_{\Delta B}$&$R_{\rm teo}$&$R^1_{\Delta B}$&$R^2_{\Delta B}$ \\
 &$\frac{R}{R_{\odot}}$&$\frac{R}{R_{\odot}}$&$\frac{R}{R_{\odot}}$&$\frac{R}{R_{\odot}}$&$\frac{R}{R_{\odot}}$ \\
\hline\noalign{\smallskip}
Mod. 1 &34.7  &34.8  &34.3  & 37.5  & 36.3\\
Mod. 2 &36.7  &36.6  &36.7  & 36.7  & 38.6\\
Mod. 3 &59.1  &59.0  &58.6  & 59.5  &  60.9\\
Mod. 4 &64.6  &65.7  &65.2  & 63.1  & 73.1\\
Mod. 5 &82.1  &82.2  &81.0  & 81.3  & 78.0\\
Mod. 6 &92.4  &92.3  &91.3  & 90.6  & 94.0\\
Mod. 7 &98.6  &98.5  &97.3  & 99.4  & 99.6\\
Mod. 8 &190.3 &188.8 &185.7 & 185.8 & 153.4\\
Mod. 9 &206.9 &206.5 &204.1 & 202.0 & 203.1\\
Mod. 10&223.1 &223.4 &220.6 & 187.7 & 177.0\\
\hline
\end{tabular}
\end{table}