Gain in RV rms on the residuals brought by the model of Eq. (1) compared to a simple linear model in log vs. stellar inclination. The gain is defined as the rms of the residuals after a correction for the linear model divided by the rms of the residual after correction for the non-linear model. The black line indicates the median values over all realisations for the seven spectral types, and the colours correspond to different percentiles: 68.3% (red), 95.4% (orange), and 99.7% (green).