Radial velocities obtained from calculations with different layer depths for the “standard” rotation velocity (top; cases 61c,d) and the “slow” velocity (bottom; cases 61a,b). Also plotted are the corresponding best-fit Keplerian curves and the curve that describes the actual orbital motion (continuous curve). Crosses and the dotted curve correspond to dR/R₁ = 0.06; and triangles and the dash curve correspond to dR/R₁ = 0.10. The perturbations due to tidal flows are more significant for the “slow” rotation velocity cases.