Light curve of FS Aur folded with the 875-day period (top panel). The number of points is reduced compared to Fig. 1 by averaging long nightly sequences to one point. In the second panel from the top, the eccentricity modulation is shown for the best solution to explain the VLPP (M₃ = 48   M_J and P₃/P₂ = 13.4). The next panel depicts the variation of the Ψ parameter (see Eq. (4)). The percentual change in the position of inner Lagrangian point of the close binary is shown in the bottom panel. All curves are repeated for two periods for better visual presentation.