Eccentricity-period diagram of a sample of Ba, CH, and S giant systems with accurate masses. The colour of the symbol depends on the mass of the primary (Ba, CH, or S) star, with the darkest symbols associated with the least massive stars and according to the colour scale on the right-hand side. The orbital elements of the progenitors, which are Ba and CH dwarfs and sub-giants, are overplotted with black crosses.