\begin{table}%t2
%\centering
\par
\caption {Model parameters for different cases of star-planet magnetic interaction.\label{table_conf}}
\begin{tabular}{ccccccc}
\hline\hline
Star & $a$ & $\alpha$ & $\theta_{0}$ & $r_{\rm e}$ & $\Delta \phi_{\rm e}$ & $r_{\rm L}$ \\
 & & & (deg) & ($R$) & (deg) & ($R$) \\
\hline
HD~179949      & 1.4 & --0.100 & 38.85 & 7.72 & 66.4 & 34.7 \\
               & 0.0 & --0.120 & 26.62 & 7.72 & 73.8 & 30.1 \\
$\upsilon$ And & 1.4 & --0.180 & 48.90 & 10.16 & 173.6 & 18.6 \\
               & 0.0 & --0.208 & 32.85 & 10.16 & 173.7 & 17.3 \\
$\tau$ Boo     & 1.4 & --0.130 & 44.50 & 6.12 & 72.7 & 26.3 \\
HD~189733      & 1.4 & --0.100 & 38.48 & 8.32 & 77.9 & 34.7 \\
HD~192263      & 1.4 &  0.025 & 18.24 & 41.19 & --106.7 & 143.0 \\ 
\hline
\end{tabular}
\end{table}