Fig. 4
Top panel: generalized Lomb-Scargle periodogram of the g-band photometric time series of BD+20 1790. The solid black line isthe normalized power versus period, the dotted red line is the spectral window, and the horizontal dashed line indicates the power level corresponding to a FAP = 0.01. Bottom panel: CLEAN periodogram. The red mark is the most powerful and significant peak in the periodogram.
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