\begin{table}%t4
\caption{\label{tab4}Relative fluxes between Br$\gamma$ and $K\rm s$-band, normalised to the median ratio of all the objects in the field.}              %\centering
\par
\begin{tabular}{c c}        % centered columns (4 columns)
\hline\hline                 % inserts double horizontal lines
Object &  $F_{Br\gamma}$/$F_{K\rm s}$            \\    % table heading 
\hline                        % inserts single horizontal line
A      & $1.02\pm0.07$ \\
B      & $1.12\pm0.08$ \\
C      & $0.78\pm0.09$ \\
E      & $0.82\pm0.10$ \\
F      & -- \\
\hline
\end{tabular} 
\end{table}