Fig. 4
Upper panel: radial velocity measurements of CoRoT-18 with 1-σ error bars as a function of time together with their Keplerian fit (top) and residuals of the fit. The fit is described below in Sect. 4.4. Lower panel: same as above but as a function of the orbital phase. The data are from SOPHIE (red circles), HARPS (blue diamonds), and FIES (green squares).
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