Reflected energy (top plot) and polarisation (bottom plot) around the 6.4 keV Fe K-α line for varying μ, shown with a resolution of 5 eV. The values of μ illustrated were obtained by adjusting the m_norm parameter in the mass-relation of clumps using Eq. (5). As expected, for increasingly large volume-filling factors, the probability of fluorescent photons intercepting the clumps increases, resulting in an increase in the shoulder’s flux. Note that, because the X-ray signal is really dependent on the projected area (see Sect. 3.1.4), which roughly goes as μ^{2 / 3}, we would expect a volume-filling factor of μ ~ 0.001 (project area ~0.01) to already produce a visible signature in the X-ray spectrum. Indeed, from the polarisation fraction plot, it is clear that at μ = 0.001 the signal starts deviating from the virtually homogeneous case.