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Fig. 2

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Optical/IR and X-ray evolution of SAX J2103.5+4545. The time bin for the BAT light curve is 2 days. There is a notable correlation between the variability in the optical/IR and X-ray bands. The correlation of the X-ray flux with the 12.7 orbital period (only during bright state) can be better appreciated in the small panel which displays a zoom of the 2012 X-ray outburst.

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