Doppler signals of HD 224018 induced by the four planetary companions. For planets b, c, and d, phase-folded data are shown. The best-fit models are indicated by a red curve. For HD 224018 d we used the maximum likelihood values of the Keplerian parameters (K_d = 0.43 ms⁻¹; P_d = 138.07 d; T_c = 2457741.745 BJD; e_d = 0.018; ω_*,d = 2.74 rad). For HD 224018 e the RV time series is shown because the orbit is not fully characterised. The error bars include the uncorrelated jitter added in quadrature to the RV uncertainties.