Derived quantities of the total flux density (panel a), the polarized flux density (panel b), the degree of polarization (panel c) as well as the EVPAs (panel d) over core distance for the two major polarized features, A (blue) and B (green), together with the components C 1/C 2 (black). We use the mean flux-weighted core distance of all model components within each feature in a given epoch to describe the core distance of that feature. All quantities are averaged over the contained model components. The different EVPA evolutions are matched by occasional shifts of 180^°.