\begin{table}%t2
 %\centering
\par
   \caption{\label{tab_exoplanets}Summary of exoplanetary parameters available in NStED.}
   \begin{tabular}{@{}lll}
     \hline\hline
     Published Parameters & Predicted Parameters & Associated Data \\
     \hline
     Number of Planets & Habitable Zone          & RV Curves \\
     Planetary Mass    & Astrometric Signature      & Light Curves  \\
     Orbital Parameters    & Radial Velocity Signature  & High-Contrast\\
     Link to entry in & Transit Depths & Images \\
     \url{http://exoplanet.eu} &  & \\
     \hline
   \end{tabular} 
\end{table}