Fig. 4
Same as Fig. 2, but for the Hα emission line as observed in August 2013. The mean periodogram over the wavelength interval 6545−6580 Å (top panel) reveals its highest peak at ν2 = 0.245 day-1. The middle panel displays the residual periodogram once the data have been prewhitened for the signal corresponding to the ν2 and ν3 frequencies.
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