Signal-to-noise ratio, , σ_cosι, σ_λ, , , and c_cosιλ as a function of cosι, keeping the other parameters fixed to the values of AM CVn. The vertical dashed line is the measured value of ι for this binary, 43°. The best known value for the amplitude is . As expected, the S/N is higher for face-on than edge-on orientations. The relative uncertainties in the amplitude and inclination are very large for inclinations up to 10°. The bottom-right panel shows the normalised correlations as the dotted line and c_cosιλ as the solid line.