Histogram of values αox, relation between optical/UV and X-ray emission for two samples, sources with black hole mass 107.5 ≤ MBH/M⊙ ≤ 108.5. a) Sample of AGN (Vasudevan et al. 2009), with λEdd ≤ 0.1, solid line; b) sample of AGN (Grupe et al. 2010), bright soft X-ray selected AGN, dashed line, and sample subset of sources with λEdd ≤ 0.2, dotted line.
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