Fig. 12.
Two-dimensional Fourier periodogram of the time series Hα profile from Fig. 11. Spectral power is indicated in grey-scale. The plot’s horizontal range is ±300 km s−1 around the line core while its vertical range is from 470 d at the bottom to 2 d at the top. The dominant excess power is detected at a frequency of ∼0.17, corresponding to a period of 5.92 d.
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