Combined vrad of FF Aql. Top: centroid vrad (RVcc-c) obtainedwith the ALL template on the green range for four spectrographs, phased (ϕ) along the Cepheid pulsation period and not binary-corrected. Bottom: same, but the vrad have been corrected from the Keplerian orbit of the binary companion. Our best spline curve is displayed as a red solid line. The vrad are corrected only from the Keplerian orbit (no offset correction), based on the orbital parameters recently computed by Gallenne et al. (2019). The red box contains one of our few CORALIE vrad outliers (see text), which we did not take into account to build the spline curve.
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