\begin{table}%t3
%\centering
\par
\caption{Effect of the observing flux limits on correlated data: most radio fluxes in our sample are obtained with the VLA, which can detect 0.1~mJy within a 10~min snapshot. Chandra can go as deep as $10^{-14}$~erg/s/cm$^2$ in a 1000~s observation. \label{tabMCTest}} 
\begin{tabular}{lcccc}
\hline \hline
\noalign{\smallskip}
Radio limit [mJy] & X-ray limit [erg/s/cm$^{2}$]&  $\xi_{\rm R}$ & $\xi_{\rm M}$ & $b_{\rm X}$ \\
\hline \noalign{\smallskip}
no limit& no limit & $1.40 \pm 0.11$ &  $-0.86 \pm 0.15$ & $-4.84 \pm 3.2$ \\
0.5 & $10^{-13}$ & $1.37 \pm 0.11$ & $-0.80 \pm 0.15$ & $-4.21 \pm 3.2$ \\
5 & $10^{-13}$ & $1.34 \pm 0.10$ & $-0.77 \pm 0.13$ & $-3.67 \pm 3.1$ \\
0.5 & $10^{-12}$ & $1.36  \pm 0.12$ & $-0.76 \pm 0.16$ & $-3.94 \pm 3.4$ \\
5 & $10^{-12}$ &$1.27 \pm 0.10$ & $-0.64  \pm 0.12$ & $-1.75 \pm 2.8$ \\
\hline
\end{tabular}
\end{table}