Fig. 3.

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O−C plots for both components of double Cepheids with anticorrelated phase shifts (r < −0.7). A common orbital fit is shown. The first four objects show clear LTTE, although for OGLE-LMC-CEP-2699, a fourth-order polynomial had to be subtracted from the O−C curves. Anticorrelated variability can also be seen for OGLE-LMC-CEP-0835 (after subtraction of a parabola) but the secondary shows strong deviation at 1500 days. The phase shifts of OGLE-LMC-CEP-0571 can be explained by an anticorrelated linear period change of the components and do not prove binarity.
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