Fig. 6

Top left panel: differential R-band magnitude time series of HR 3549. Top middle panel: LS periodogram. The dotted line represents the spectral window function. The horizontal dashed line is the power level corresponding to a 99.9% confidence level. Top right panel: CLEAN periodogram. Bottom panel: light curve phased with the P = 0.458 d rotation period. The solid line is a sinusoidal fit with amplitude ΔR = 0.008 mag.
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