Fig. 8.

Reflection spectrum (left, black) for different geometries (right). Black curves are normalised at 20 keV, with offsets. The red dashed lines illustrate the observed power law. The top example shows reflection off a semi-infinite disk. The middle four examples show a single blob with column densities log NH = 23, 24, 25, and 26. In low-density blobs, the reflection extends to low energies, while for the densest blobs the spectrum rises rapidly (powerlaw photon index ≈0). The bottom examples show mixtures of the reflection spectra, assuming equal covering factors in all but the last. Mixtures have a wider Compton hump with a smooth bend. The exceptions are the bottom three examples, which lack the log NH = 24 blob. Their powerlaw-like spectrum approximately follows (red dashed line). The dotted green line shows the radiative fountain model.
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