There are three size scales on which symmetries appear or change in the radio structure: The first is 1.5' = 300 h50-1 kpc. The jets appear to become symmetric on this scale but are asymmetric on smaller scales. If the J2 and K components (Figure 4) are symmetric features in the jet and counterjet, any Doppler boosting from relativistic motion must have disappeared by this point in the jet. The second scale is 3.2' = 640 h50-1 kpc. On this scale, there is a dramatic brightening of both lobes. The third scale is 6.5' = 1300 h50-1 kpc. At this distance, the lobes become even brighter and strong filamentary structure appears. This is the distance at which regions of spectral anomaly appear in the extended emission.
The largest scale symmetries thus suggest a symmetric overall environment, apart from the slight non-collinearity (C-symmetry) of the structure. The small scale brightness asymmetries of the jet and counterjet might be attributed to Doppler boosting and dimming by relativistic motion which effectively disappears by ~ 300 h50-1 kpc, i.e. on a scale more typical of a "non-giant'' FR II source. We reiterate however that the small asymmetry in rotation measure dispersion (variance) between the lobes is opposite in sign to that expected on this interpretation. This asymmetry seems more likely to reflect an intrinsic asymmetry (or gradient) in the foreground magnetoionic medium.