Posterior distribution of the parameters of the Keplerian model for the ESPRESSO data, together with a linear instrumental offset (including the stellar radial velocity) and instrumental jitter. The parameters considered for the Keplerian one-planet model are period (P_b), mean longitude at t = 0 (L0_b), radial velocity semi-amplitude (K_b), eccentricity (e_b), and argument of periastron (ω). The figure was made using the corner python package (Foreman-Mackey 2016).