Fig. 5.
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Eccentricity of the outer orbit of compact triply eclipsing triples vs. the ratio of the tertiary’s radius to the outer semi-major axis. With three exceptions (lower left corner), it seems reasonable to infer that tidal circularisation of the outer orbit by evolved (i.e. large) tertiaries is responsible for the decaying outer eccentricity with increasing RB/aout.
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