Top panel: generalized Lomb Scargle periodogram of the radial velocity measurements of HD 90156. An FAP of 0.1% is indicated by the dashed-dotted line. The peak at about 50 days is very clear and has an FAP far below this value. Middle panel: radial velocities and residuals as a function of Julian Date and (bottom panel) as a function of orbital phase for the one-planet Keplerian fit (P = 49.8 days).