Parameter space of intrinsic jet speed β and viewing angle θ allowed by our observations. The blue shaded area is the one allowed by the measurement of R (θ as function of β given R, that is, θ_R), while the red shaded area is the one allowed by the observed β_app (θ as function of β given β_app, that is, θ_βapp). For each source we provide a minimum, maximum and (except for PKS 0521−36) a central estimate of R and β_app. The top-right legend reports the resulting limits on θ and β. The dashed colored lines and boxes indicate constraints from previous works, namely Hardcastle et al. (2016), Tingay et al. (2000) for Pictor A (0518−458), Pian et al. (1996), Giroletti et al. (2004), D’Ammando et al. (2015) for PKS 0521−36 (0521−365), and Venturi et al. (2000) for PKS 0625−35 (0625−354).