Spectroscopic data for HD 111998. Top row: HD 111998 RV time series (left), RV Lomb-Scargle periodograms (middle) and temporal window of the observations (right). The Keplerian fit is superimposed (red solid line) to the RV, as well as the linear trend (dashed blue line). On the RV periodogram, the FAP at 1% (solid line) is indicated in red; the planet period is indicated in blue. Second and third rows: BIS and FWHM time series, corresponding Lomb-Scargle periodograms and correlations with the RV data. Fourth row: Residuals of the fit as a function of time, periodogram of the residuals and BIS correlation with the residuals.