Combined RV curve for the assumed WNL primary of F2. SINFONI data are plotted as diamonds; KMOS and NIRSPEC as squares. The solid blue horizontal line indicates the approximate systemic velocity (relative to F1); the dashed blue lines indicate the systemic velocities associated with the curves derived from the Brγ and N III lines separately, and may be taken as the uncertainty on the systemic velocity for the combined RV curve.