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Fig. 4


Current O–C diagram for EX Dra. New eclipse times are denoted by circles, those obtained from the literature are depicted by dots. Top: O–C diagram with respect to the linear term of quadratic ephemeris. The curve represents the best-fit quadratic ephemeris. Bottom: O–C diagram with respect to the linear term of sinusoidal ephemeris. The curve denotes the best-fit sinusoidal ephemeris with a period of about 21 years.

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