Doppler tomographic data sets and Fourier filters. The first, second, and third columns show the data sets of TS23 in 2008, HDS in 2011, and TS23 in 2014, respectively. Top row: Observed residuals of line profile series. The virtual dotted lines show v = 0, ±v sin i_⋆. The bottom, middle, and upper horizontal dotted lines show the beginning, middle, and end of WASP-33b’s transit, respectively. Second row: Fourier spaces after Fourier transform of the residuals of the line profile series. These color scales are shown in square roots. The faint narrow structure from the right bottom to the left upper is a component of WASP-33b’s planetary transit. On the other hand, the bright wide structure from the left bottom to the right upper is a component of pulsations. Third row: Filtered Fourier space so that only the transit component remains. (Color online)