Profile along radio shock in R2. From top to bottom: Surface-brightness profiles at 145 MHz (0.4″ and 1.9″ resolutions, empty and filled circles, respectively) and 3.0 GHz (1.9″ resolution, filled diamonds), with vertical dot-dashed lines placing the position of the break and bottleneck; spectral index profile at 1.9″ between 145 MHz and 3.0 GHz, with the horizontal dashed line showing the mean value; intrinsic polarisation fraction; rotation measure, without the correction for the Galactic foreground (${\mathrm{RM}}_{\mathrm{Gal}}=60\pm 12{\mathrm{rad}\mathrm{m}}^{-2}$; Hutschenreuter et al. 2022). The bottom two panels are made with data taken from Di Gennaro et al. (2023), in the 2–4 GHz band at 5″ resolution (see horizontal error bars). In all panels, the shaded areas define the uncertainties of each measurement.