Fig. 2.
2D Time-frequency image of the power spectrum for the r′ light curve. The X-axis is the orbital phase and the Y-axis is the frequency in the restricted range 0–3 Hz. Colour-coded squared amplitude (with Leahy et al. 1983 normalisation) is shown according to the scale on the right. Individual (99.87 s) spectra are shown and the image has been smoothed with a 2-point Gauss filter. The corresponding r′ light curve is shown at the top.
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