Ratio of the flux of western to eastern components, R, as a function of the inclination angle, θ, and the hot spot speed, β_HS. The different hot spot speeds are colour-coded; the spectral index is given by the opaqueness of the different regions (a more saturated tone is a steeper −0.84 > α > −1.4). The dashed horizontal lines constrain the parameter space with R within its error (see Eq. B.1).The θ_min value is determined by comparing the measured projected size with large radio galaxies. The θ_SED value shows the suggested inclination angle of the inner jet by the SED.