Fig. 7
Fraction of radio-excess sources in different X-ray luminosity bins; the fraction of sources with excess radio emission increases with X-ray luminosity, from ≈7% at LX = 1040 − 1041 erg s-1 to ≈60% at LX = 1044 − 1045 erg s-1. The error bars correspond to 1σ uncertainties (Gehrels 1986). The dashed histogram represents the radio-excess fraction including the X-ray upper limits (Sect. 2.4).
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