\begin{table}%t7
\caption{\label{t7}Cluster sizes and field contamination.}
\par
\small%\centering
\par
\begin{tabular}{lccccc}
\hline\hline
Name &   Background ($\times 10^4$)  & $r_{\it FWHM}$ & $r_{\rm cls}$ &  \multicolumn{2}{c}{Field contamination (\%)} \\
 & (star/px$^2$) &  (px)   &  (px)  &  $r < r_{\it FWHM}$ & $r_{\it FWHM} <  r  <  r_{\rm cls}$ \\
\hline
NGC~1697 & 66.0 $\pm$ 7.0 & 80  & 250 & 33 & 66 \\ 
SL~133   & 23.0 $\pm$ 5.0 & 90  & 170 & 23 & 60 \\
NGC~1997 & 11.0 $\pm$ 3.0 & 50  & 120 & 13 & 40 \\
SL~663   & 36.0 $\pm$ 6.0 & 110 & 290 & 28 & 65 \\
OHSC~28  &  4.0 $\pm$ 0.2 & 25  & 50  & 10 & 40 \\
\hline
\end{tabular}
\end{table}