Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS - V. Discovery of two new DBV pulsators, WDJ152738.4−450207.4 and WD 1708−871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058−5234, and EC 04207−4748

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Fig. 3.

Top: Main pulsational mode in PG 1351 presented in Table 3. Fourier transform of data taken in sector 16, 22 and 23. The red dashed line denotes the 0.1% FAP. Bottom: Sliding Fourier transform sectors 22 and 23 of PG 1351+489 concentrating the main pulsational mode. The color-scale illustrates amplitude in ppt units.

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