tokens: we do not consider the spherical reprocessor further. Figure 6. The spherical reprocessor of Brightman Nandra ( 2011 ), compared to the data. Colours as for Fig. 5 . 5 MYTORUS The toroidal X-ray reprocessor model, mytorus (Murphy Yaqoob 2009 ; Yaqoob et al. 2010 ), is illuminated by a central X-ray continuum source. The global covering factor of the reprocessor is 0.5, corresponding to a solid angle subtended by the structure at the central X-ray source of 2 (an opening half-angle of 60 o ). mytorus self-consistently calculates the Fe K α and Fe K β fluorescent line emission and includes the effects of absorption and Compton scattering on both the continuum and lines. mytorus offers the ability to leverage constraints on the Fe K line emission and spectral curvature together, to obtain both the global and line-of-sight column density. The model is therefore one of the most powerful available for fitting X-ray spectra. Although the nominal covering factor is fixed at 50 per cent of the sky as seen by the continuum source, one can model other physical possibilities using the ‘decoupled’ mode that allows for a different line-of-sight column to the gas responsible for reflection (the Fe line emission strength can still be linked self-consistently to the column of the reflector). Such a decoupling is often required in spectral analyses of high-quality broad-band X-ray spectra, because the column density in and out of the line-of-sight column density are not always the same (e.g. Risaliti et al. 2009 ; Marchese et al. 2012 ; Yaqoob et al. 2015 ). In our fits, a single power law was assumed to be seen in transmitted and scattered light, and this was implemented by linking the photon indices of these components in all fits. The general model form was where MYTZ designates the line-of-sight absorption, MYTS the scattered X-rays, and MYTL the line emission (both from material out of the line of sight, hereafter referred to as the ‘global’ gas), from mytorus . zg(10) represents 10 individual Gaussian lines (Table 2 ) present in the data that are not accounted for by the mytorus model. gs is a Gaussian smoothing component convolved with the torus neutral Fe line profile, using a kernel of σ = 30 eV at 6 keV. The power-law continuum is split over two sightlines, one is absorbed my MYTZ and the other is absorbed only by N H , a full-covering column of gas whose lower limit is set at the Galactic line-of-sight absorption, but whose upper limit is not constrained. 5.1 Coupled model fits Taking the ‘Coupled Model’ to mean one for which the line of sight and global column densities are tied together, we performed two variations on this fit. First, the angle of the global gas was fixed at θ = 90 o and the normalization of the global-scattered light and line emission were directly tied to the illuminating continuum. This model did not provide an acceptable fit to the data, yielding χ 2 = 709/438 dof with , while the full covering gas component gave , exceeding
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