X-ray luminosity as a function of the time delay for the different MCs, as inferred from the measured cloud properties. We have divided the MCs into subgroups depending on the type of Fe-Kα line variability exhibited. Also plotted are the 90% confidence ranges on the L_X calculation. The vertical dotted lines represent the constraints on θ derived in Sect. 4.1. Where only one vertical line is shown for a cloud, it represents the right-hand boundary of the allowed range; in these cases the second boundary is situated to the left of the Y axis (i.e., θ ≥ 155 deg), and therefore not plotted.