Fig. 3
αox as a function of the 2500 Å specific luminosity LUV, for samples A (circles and triangles) and B (circles) and for the sample of Paper I (dots). Triangles refer to radio-loud sources, circles to radio-quiet and radio-unclassified sources. Linear fits are shown for the present work, and are marked for previous works G10 (Grupe et al. 2010), V10 (Paper I), J07 (Just et al. 2007), G08 (Gibson et al. 2008).
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