Fig. 5
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Cumulative χ2 distributions. The blue curve is the distribution of the χ2 difference between the 2L1S and 2L2S solutions, 
, and the red curve represents the distribution of the χ2 difference between the 3L1S and 2L1S solutions, 
The light curve in the upper panel is presented to show the region of fit improvement. The shaded region marks the region of major fit improvement.
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