Same as Fig. 1 but after correction for the orbital velocity of the Cepheid component as described by the parameters listed in Table 2. The residuals in the middle and right panels are plotted as a function of the pulsation phase and BJD, respectively. The derived pulsation velocity curves shown in the left panel, including that from this work (blue open diamonds), have a dispersion much lower than in the left panel of Fig. 1. The rms residuals in the middle and right panels are about 0.4 km s⁻¹. The RV_cc-g curve corrected for the binarity and corresponding to this work is also shown in Fig. 5.