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Fig. 1

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Top: best single lens fit. Bottom: zoom close to the peak and residuals for single and best binary lens fits (close model). The geometry of caustic crossing is on the right (see inset), where the source star is represented by the blue circle. Note that the grey curve is for limb-darkening coefficient Γλ = 0.49 (R band) and the red curve is for Γλ = 0.67 (V band) in the middle panel.

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