Fig. 7
Amplitude spectrum of the orbit-subtracted Ultracam light curve (LC), for the two frequency regions where pulsations are observed. Upper panel: the amplitude spectra of the three photometric channels (red: r-band, green: g-band, blue: u-band). Middle panel: the same spectra after prewhitening the 10 frequencies listed in Table 6 from the LC. Lower panel: window function for the two frequency regions.
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