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Fig. A.1.

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Aperture selection of TPFs. Fig (a) shows how the SNR of the frequency with the highest amplitude varies from the number of pixels. (b) The TPFs with the median value of PG 0101+039. The size of the green dot represents the relative brightness of the star, and the white ’×’ is the location of our target star. The plum boxes are the pixels used for extraction.

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