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Fig. 4.


Left panel: histogram of the Cepheids that show a proper motion anomaly (Δ >  3, dark blue), with the additional stars classified as binaries in the database maintained by Szabados (2003b; medium blue) and the overall sample (light blue) as a function of parallax. Right panel: binary fraction as a function of parallax. The error bars represent the binomial proportion 68% confidence interval.

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