Left panel: histogram of the quiescent radio luminosities of all sources detected by Zapata et al. (2004) (empty histogram) and those with X-ray counterparts (hashed histogram). Right panel: histogram of the quiescent COUP X-ray luminosities in the area probed by Zapata et al. (2004) with the VLA (empty histogram) and those with radio counterparts (hashed histogram) on a logarithmic scale.
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