Fig. 3
Top panel: distribution of 
for the radio-Planck sample based on Eq. (4) when assuming Γ = 20, and for two different external photon fields: dust torus photons peaking at IR 
(in red); near-UV photons from the BLR region, peaking close to Lyα, 
(full indigo bars). Bottom panel: corresponding distribution of log(Bδ) calculated from Eq. (3) for 
, and considering 
and 
from Table A.1.
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