Fig. 2.
Left: eclipse light curves in the high, intermediate, and in the low state, the former two shifted upward to avoid overlap. Phases are from Eq. (1) for the high and intermediate states and from and Eq. (2) for the low state. Right: O − C diagram for the deviations of the mid-eclipse times from the linear ephemeris of Eq. (1), showing the change in orbital period.
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