  Broad lines in active galaxies are primarily emitted by photoionization
processes that are driven by the incident continuum arising from a complex
geometrical structure circumscribing the supermassive black hole. A model of
the broad-band spectral energy distribution (SED) effective in ionizing the
gas-rich broad line emitting region (BLR) is needed to understand the various
radiative processes that eventually lead to the emission of emission lines from
diverse physical conditions. Photoionization codes are a useful tool to
investigate two aspects - the importance of the shape of the SED, and the
physical conditions in the BLR. In this work, we focus on the anisotropy of
continuum radiation from the very centre a direct consequence of the
development of a funnel-like structure at regions very close to the black hole.
Accounting for the diversity of Type-1 active galactic nuclei (AGNs) in the
context of the main sequence of quasars permits us to locate the super
Eddington sources along the sequence and constrain the physical conditions of
their line-emitting BLR.
