\begin{table}%t2
\caption{\label{tab2}Polarization measurements.}             % title of Table
%\centerline
 {                          % used for centering table
\begin{tabular}{l l l l l l }        % centered columns (4 columns)
\hline\hline                 % inserts double horizontal lines
Object  &${\it SpT}$   &Filter &  Exposure time &  D(p) & $\theta$  \\    % table heading 
 &   & &  (s) &  (\%)&  (degrees)  \\ 
\hline                        
2MASSW J1438082+640836 & M9.5 &   $I$  & 	90    & 	0.482 $\pm$ 0.071 & 66.24  \\
 &  & $R$ & 300  & 0.54  $\pm$ 0.097 & 115\\
 2MASSW J1507476-162738 & L5  & 	$I$  & 150 & 	0.0 $\pm$ 0.036 & \ldots   \\  % inserting body of the table
 &  & $R$ &300 & 	0.216 $\pm$ 0.022 & 100.26   \\
2MASS J17312974+2721233  &  L0  & 	$I$  &  60  & 	5.195 $\pm$ 0.854 &  52.57   \\
 &  & $R$ & 240 & 0.666 $\pm$ 0.169 & 111.08\\
2MASSI J1807159+501531 & 	L1.5 & 	$I$ & 60  & 	0.711 $\pm$ 0.142  & 46.67 \\
 &  &  $R$ & 120 & 1.669  $\pm$ 0.605& 101.2 \\
\hline                                   %inserts single line
\end{tabular}}
\par
\smallskip
Note: {the uncertainty in $\theta$ due to calibration errors is about 1.2~degrees.}
\end{table}