Known low-mass exoplanets host stars measured with SOPHIE+. Upper left panel: phase-folded radial velocity curve of Gl 436. The model includes the 2.6-day Keplerian. Residuals of SOPHIE+ data (red, filled diamonds) are less dispersed than those obtained without the octagonal fiber (black, open diamonds). Upper right panel: SOPHIE+ radial velocities of HD 190360 as a function of time. The model includes the 17.1-day Keplerian and the long-period planet, which produces a  ~1  m s^-1drift on the 3-week span displayed here. Lower left panel: SOPHIE+ radial velocities of HD 219828 as a function of time. The model includes the 3.8-day Keplerian, as well as the long-period planet which produces a  ~2  m s^-1drift on the 1-month span displayed here. Lower right panel: SOPHIE+ radial velocities of HD 7924 as a function of time. The model only includes the 5.4-day Keplerian.