Phase-folded radial-velocity and light curves. Top: RV curve of the fundamental pulsator S Cru. The red solid line displays the PLOESS fit to the RV curve. The horizontal red dashed and dotted lines display the mean RV (〈RV〉) and its uncertainty. The vertical red dotted line displays the phase where RV equals 〈RV〉 on the rising branch. The name, 〈RV〉, period and reference epoch are labelled. Bottom: same as in the top panel but for the V-band light curve, its PLOESS fit and its mean value. We note that within the uncertainty, the light curve is co-phased with the RV curve.