\begin{table}%t4
\caption{\label{T4}Change in the mass factor~($1/\sin i$) and libration period~$P_\theta$ with inclination~($i$).} 
%\centering
\small
 \begin{tabular}{crrrrr}
 \hline\hline
$i$    & $90^\circ  $ & $30^\circ  $& $20^\circ  $& $15^\circ  $& $10^\circ  $ \\
 \hline
$1/\sin i$ & 1.00  &      2.00  &      2.92  &      3.86  &      5.76    \\
 $P_\theta$ (yr) & 39.93  &     28.88  &     23.17  &     19.57  &     15.35    \\ 
 \hline
\end{tabular}
\end{table}