Tomography of the pulsation filtering from the mean line profile residuals. From top to bottom: transits 1, 3, and 4, respectively. Left panels: contour plot of the mean line profile residuals. Central panels: same as for left panels, but after filtering in the Fourier space. Right panels: same as for central panels, after subtracting the best-fit Doppler shadow model. The horizontal white lines show the beginning and end of the transit.