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Fig. 7

image

Light curves A2-A1, B-A1, and C-A1 are shown in the V (left) and R band (right) in the upper, middle, and bottom panels, respectively. The differences are computed, after correcting for the known time delays, by interpolating in between the data points of the brightest component of each pair. The difference between C and A1 in the R band shows a significant magnitude variation of 0.16 mag between 2008 and 2011.

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