Left: distribution of the time sampling corresponding to the maximum RV differences (RV range) for SB1 candidates of the sets 1 (red) and 2 (blue). Right: distribution of the SB1 orbital periods assuming that the amplitude K of the RV curve may be derived from Eq. (16) for sets 1 and 2 (red and blue filled histograms) and for SB1 dwarfs and giants (from set 2, blue and red empty histograms). The distribution of FGK-type SB1s from the SB9 catalogue (Pourbaix et al. 2004) is overplotted in grey.