Multiple transits of Kepler-20 b + c (dots) together with our Blender models (red). The error bars indicate the 1σ error of the data taken from the FITS files. Simulated PPOs present in six out of seven transits are indicated by arrows. We plot every Blender model resulting from our set of α values on top of each other in order to visualize the variation in position of the PPOs in the transit. Below every transit, we show the residuals between the data and our Blender models for the null-hypothesis α = 0°.