Simulated X-ray spectra, with geometries shown on top. Left panel: spectra of a Compton-thick bi-cone cut-out geometry in edge-on view. Liu & Li (2015, shown as ①) demonstrated that the model of Brightman & Nandra (2011a, shown as ②) should not leak soft (≲4 keV) photons. We obtained with our code XARS (shown as ③) the same spectrum as Liu & Li (2015). Right panel: comparison of this uniform density toroid with a gradient toroid (shown as ④) and our unified clumpy model (shown as ⑤). The arrow highlights that, unlike the smooth geometry, leakage of soft photons is possible in the clumpy torus. In the main plots, we removed spectral lines to highlight the continuum shape. The insets show a zoom around the Fe Kα and β features, normalised at 7.07 keV. They feature the strongest scattering low-energy tails in the ⑤ unified clumpy model.