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Fig. 3.
Periodograms and phase-folded light curves of the UHE white dwarfs J0032+1604, WD 0101−182, J0146+3236, and HS 0158+2335. The red solid lines are phase-averaged light curves, while the dotted light curve represents the actual data. The black line is a fit of a harmonic series used to predict the peak-to-peak amplitude.
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