Fig. 3
Top panel: r-band light curve obtained for the system 4U 0614+091. Superimposed, the fit of the dataset with a straight line. Bottom panel: residual light curve after the subtraction of the straight line obtained with the fit of the light curve in the top panel from the dataset itself. Superimposed, the fit of the curve with a sinusoidal function + a constant. With a dashed line we indicated in both panels the fraction of the day that corresponds to the possible polarisation flare (Fig. 2).
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