\begin{table}%t2
%\centering
\par
\caption{\label{hrc_data}ACS/HRC measurements of systems with multiple components.}
$$
\begin{tabular}{lcccr@{$\pm$}lr@{$\pm$}lr@{$\pm$}l}
\hline\hline
\multicolumn{1}{c}{System name} & \multicolumn{1}{c}{Filter} & \multicolumn{1}{c}{Pair} & MJD & \multicolumn{2}{c}{Separation} & \multicolumn{2}{c}{Orientation} & \multicolumn{2}{c}{$\Delta m$} \\
&                            &                          &     & \multicolumn{2}{c}{(\arcsec)}  & \multicolumn{2}{c}{(degrees)}   & \multicolumn{2}{c}{(mag.)}     \\
\hline
15 Mon     & F658N  & Aa-Ab & 53669.96 & $ 0.089$ & $0.001$ & $247.90$ & $0.57$ & $1.62$ & $0.01$ \\
&        & Aa-B  & 53669.96 &            $ 2.969$ & $0.001$ & $213.29$ & $0.01$ & $3.08$ & $0.01$ \\
Cyg OB2-22 & F850LP & A-Ba  & 53733.14 & $ 1.521$ & $0.001$ & $146.19$ & $0.03$ & $0.59$ & $0.01$ \\
&        & Ba-Bb & 53733.14 & $ 0.216$ & $0.001$ & $181.48$ & $0.25$ & $2.34$ & $0.01$ \\
&        & A-C   & 53733.14 & $20.404$ & $0.001$ & $152.37$ & $0.01$ & $1.15$ & $0.01$ \\
&        & C-D   & 53733.14 & $11.191$ & $0.001$ & $ 31.37$ & $0.01$ & $0.57$ & $0.01$ \\
&        & C-E   & 53733.14 & $ 2.821$ & $0.001$ & $218.41$ & $0.02$ & $1.73$ & $0.01$ \\
&        & E-F   & 53733.14 & $ 1.850$ & $0.001$ & $189.82$ & $0.06$ & $1.89$ & $0.04$ \\
           &        & C-G   & 53733.14 & $ 3.853$ & $0.001$ & $ 32.41$ & $0.02$ & $4.02$ & $0.02$ \\
           &        & C-H   & 53733.14 & $ 7.864$ & $0.001$ & $102.32$ & $0.01$ & $4.36$ & $0.06$ \\
           &        & C-I   & 53733.14 & $10.404$ & $0.001$ & $ 58.88$ & $0.01$ & $4.56$ & $0.05$ \\
 Cyg OB2-7 & F850LP & A-B   & 53736.28 & $18.604$ & $0.001$ & $104.70$ & $0.01$ & $2.05$ & $0.01$ \\
           &        & A-C   & 53736.28 & $15.682$ & $0.001$ & $106.50$ & $0.01$ & $5.80$ & $0.02$ \\
           &        & A-D   & 53736.28 & $20.399$ & $0.001$ & $ 79.59$ & $0.01$ & $5.54$ & $0.01$ \\
           &        & A-E   & 53736.28 & $24.987$ & $0.004$ & $104.18$ & $0.01$ & $8.19$ & $0.15$ \\
\hline
\end{tabular}
$$
\end{table}