Polarization degree, Π (left panels); electric vector position angle (EVPA), Ψ (middle panels); and intensity normalized to its maximum value, I/I_max (right panels) plotted as a function of time in the observed frame, t_obs, measured in days. The jet has a cylindrical shape. Top panels: Emission from a single blob (N_blobs = 1 and η_jet = 0; dashed line) and from a single blob plus a nearly axisymmetric jet (N_blobs = 1 and η_jet = 1; solid line). Bottom panels: Emission from multiple blobs (N_blobs = 10 and η_jet = 0; dashed line) and from multiple blobs plus a nearly axisymmetric jet (N_blobs = 10 and η_jet = 1; solid line).