Top: light curve for J064024 (automatically classified as EB-type) folded at P = 44851.164 ± 0.007 s. Bottom: O−C diagram for J064024 covering six years. Blue solid line shows best linear fit (χ2 = 2.96, 466 d.o.f.); green dashed line shows best quadratic fit (χ2 = 1.01, 465 d.o.f.), strongly supporting a secular period decrease, with rate −0.277 ± 0.009 s yr-1.
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