\begin{table}%t1
  \caption{\label{obsdata}Details of observations.}
%\centering
                          % used for centering table
\small\begin{tabular}{l c c c}        % centered columns (3 columns)
\hline\hline                 % inserts double horizontal lines
Satellite/Instrument & MJD & Exposure &  Orbital  \\    % table heading 
 & & (ks) & phase  \\
\hline                        % inserts single horizontal line
{\rm RXTE/PCA} & 51925.25 & 9.296 & 0.53 \\      % inserting body of the table
{\rm RXTE/HEXTE} & 51925.25 & 6.418 & 0.53 \\
{\rm RXTE/PCA} & 51925.74 & 12.592 & 0.66 \\      % inserting body of the table
{\rm RXTE/HEXTE} & 51925.74 & 8.261 & 0.66 \\
  &  &  & \\
{\rm  INTEGRAL/JEM-X 1} & 53407.7$-$53826.3 & 360 & \\
{\rm  INTEGRAL/ISGRI} & 52651.4$-$53756.2 & 720 & \\
{\rm  INTEGRAL/SPI} & 52651.4$-$53941.4 & 1907 & \\
\hline                                   %inserts single line
\end{tabular}
\end{table}