Change of the χ² value between model and data as a function of the orbital tilt angle α. The left panel shows the results for simulations carried out with our transit parameter fits, while the right panel holds results when transit parameters from Buchhave et al. (2016) are used. The two simulated cases are shownin different colors (labels). The numbers indicate the transit in which artificial PPOs lead to Δχ² ≠ 0.