Table 3: 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/cm2 in a 1000 s observation.

Radio limit [mJy]
X-ray limit [erg/s/cm2] $\xi _{\rm R}$ $\xi _{\rm M}$ $b_{\rm X}$

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 $1.27 \pm 0.10$ $-0.64 \pm 0.12$ $-1.75 \pm 2.8$


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