Reconstruction of Cepheid Radial Velocity Curves from the shape of the V-band light curves

We present the Radial Velocity (RV) reconstruction from the shape of the V-band light curves (LC) for the calibrating sample of Cepheids and the metal-poor sample as presented in Hocdé et al. 2026 (A&A). For each star, we used empirical relations between Fourier parameters of LC and RV to reconstruct the RV curves. The shape of the RV curves is then adjusted in phase to match the Fourier fit of the spectroscopic observations. The complete set of Fourier parameters and their associated uncertainties is available at CDS, which allows reproducing the curves.