Fig 3. Cumulative distributions of the orientation angle 
for the three depolarization laws,
assuming m=1. Burn law: dotted line, partially resolved
screen: short dashed line, well resolved screen: solid line. The long
dashed line shows the expected cumulative distribution if the source
orientations are isotropic.
As can be seen from Fig. 3, all three depolarization laws give qualitatively similar results. The Burn law, with its strong dependence on the RM dispersion, gives smaller dispersion ratios and has more sources close to the plane of the sky than the other models. In all cases, however, the distribution of source orientations is non-isotropic with a preference for sources to be close to the line of sight. This is to be expected given the selection criteria for the sample, which selected against sources close to the plane of the sky by requiring a jet to be visible.