Radial-velocity and CCF FWHM measurements of K2-96/HD 3167. Left panel: radial velocities showing a long-term linear trend: red, green, blue, and light blue points show the measurements obtained with the HIRES, APF, HARPS-N, and HARPS spectrographs, respectively. Right panel: linear trend observed in the FWHM of the HARPS-N cross-correlation functions. A similar behavior is observed in the CaII S index. This implies that the slope observed in the RVs (left panel) is produced by stellar activity, and not by a physical companion.