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Fig. 4


Differential V-band residuals for R139 compared to the mean of the five check stars, phased to the 153.8 day orbit. Open circles denote the five epochs when the seeing was in excess of 20. The dotted lines indicate the expected mid-point of any possible eclipses: φ = 0.39 and 0.98 for the eclipses near apastron and periastron respectively.

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