Top panel: spectroscopic orbit of DF Cyg. The vertical blue and magenta dashed lines show inferior and superior conjunctions, respectively. The red dashed vertical line shows the phase of periastron passage and the vertical green dashed lines show the phases at which the obscuration start and end. Bottom panel: the occurrence of the same events in the Kepler light curve. The black line is an interpolation through the light curve. The horizontal dashed lines are the mean flux at maximum and minimum light phases of the RVb cycle.
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