Fig. 4.
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O − C diagram of binary A (top panel) and binary B (bottom panel) calculated by determining minima timings in all of our photometric data. Primary eclipses are shown in blue while secondary eclipses are shown in orange. Gray lines show O − C variations predicted by our best-fit global photometric model from Sect. 3.2. LTTE variations are calculated with Eqs. (5) and (6) and apsidal motion effect is evaluated using expressions from Gimenez & Garcia-Pelayo (1983).
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