Speed-time relation (top panel, similar as Fig. 4) and Radialcomponent-distance relation (bottom panel, similar as Fig. 5), with φ Lup (blue) or SC15 (orange) as reference points. For comparison, we also show the slopes when e Lup is set as the reference point, from Fig. 4 or 5 (dashed black lines). The resulting median slopes are given in the upper left corners in the respective colours (see also Table 1). The shaded areas show the 1σ uncertainties around the median slopes.