Upper: RV curve of the outer orbit. Black x-signs with grey error bars correspond to the RVs of the inner eclipsing binary centre of mass, while the red x-signs with grey error bars (in some cases too small to be seen) are the RVs of the outer component. The systemic velocity, v_γ, has been subtracted from the RVs. Lower: O − C residuals in the units of σ for each individual point.