\begin{table}%t1
\caption{\label{tab:prob_p1_p2}Expected frequency ($f_{\rm det}$) of binary stellar systems detectable by means of transit timing variations in function of the timescale~($\Delta~T$) since the discovery of the planet, and of different assumptions on the inclination of the binary stellar systems.}
%\centering
\par
\begin{tabular}{c c c c}
\hline \hline \noalign{\smallskip}
$i=90^{\circ}$ & $\Delta~T$ & $f_{\rm det}$ \\
 & (yr) & ($\%$) \\
\hline
 & 5 & $1.0\pm0.2$ \\
 & 10 & $2.8\pm0.3$ \\
\hline
$0^{\circ}\le~i\le~90^{\circ}$ & $\Delta~T$ & $f_{\rm det}$ \\
 & (yr) & ($\%$) \\
\hline
 & 5 & $0.6\pm0.1$ \\
 & 10 & $1.7\pm0.2$ \\
\hline
\end{tabular}
\end{table}