Figure 3 from Three Close Binaries in Different Evolutionary Stages in the Old Open Cluster NGC 188

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Three Close Binaries in Different Evolutionary Stages in the Old Open Cluster NGC 188

Authors: L. Y. Zhu, S. B. Qian, B. Soonthornthum, L. Liu, J. J. He, N. P. Liu, E. G. Zhao, J. Zhang, and J. J. Wang

Zhu et al. 2014 The Astronomical Journal 147 42.

Caption: Figure 3.

Σ − q curves of EP Cep (left), ES Cep Per (middle), and V369 Cep (right).