Results from RMHD simulations. A synthetic intensity map is shown of a ray-traced hybrid fluid-particle jet, moving from north-west to south-east, for a Γ = 1.08. The colour bar sets the linearly polarised intensity calculated from the Stokes Q and U parameters. The contours correspond to the total intensity flux density (Stokes I) and match those listed in Fig. 1. The image depicts the jet model as observed at a frequency of 22 GHz. The fractional linear polarisation (${\overline{m}}_{\mathrm{l}}$) level is indicated in the lower left corner. The convolving beam size (white ellipse, bottom right corner) equals the observational beam size.