Examples of HR10 (left) and HR21 (right) Gaia-ESO CCFs for the star CNAME 23354061-4305405. Two consecutive observations have been made with each setup. The HR10 epochs t₁ < t₂ and the HR21 epochs t₃ < t₄ are separated by less than one day. The S/N of each spectrum used to compute the Gaia-ESO CCF is indicated as labelled. While the SB2 nature of the system is evident from the HR10 Gaia-ESO CCFs, it is not the case from the HR21 CCFs. CCFs are shifted vertically by 0.5 for the sake of readability.