Fig. 1
Observed far-ultraviolet fluxes of HD 64740 and their variations. The fluxes were smoothed with a Gaussian filter with a dispersion of 0.1 Å to reduce the noise. Upper panel: mean flux (solid line) and the range of flux variations (lighter color). Lower panel: the wavelength dependence of the flux dispersion (over the rotational period) and the effective amplitude Eq. (2)divided by the mean flux.
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