\begin{table}%[htb]%t2
%\centering
\par
\caption{Brightness ratios $Q$ and component magnitudes $m_{\rm A}$ and $m_{\rm B}$.}
         \label{photo}
\begin{tabular}{cccc}
\hline \hline
  Filter     & $Q$ & $m_{\rm A}$ [mag] & $m_{\rm B}$ [mag]  \\ 
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
{\it F814W}        & $0.92\pm0.04$ &$18.15\pm0.03$&$18.24\pm0.03$ \\
{\it F110M}        & $0.83\pm0.02$ &$15.69\pm0.03$&$15.89\pm0.03$ \\
{\it F145M}        & $0.86\pm0.02$ &$14.96\pm0.03$&$15.12\pm0.03$ \\
{\it F165M}        & $0.87\pm0.02$ &$13.98\pm0.03$&$14.13\pm0.03$ \\
            \noalign{\smallskip}
            \hline
\end{tabular}
   \end{table}