Long-term microlensing gradient in C/B.
Notes. Using 2009–2010 and 2017–2018 data, we interpret the long-term microlensing gradient in C/B as due to linearly varying microlensing in image B. Here, c0/b0 is a dimensionless parameter and b1/b0 is a relative slope in 10−3 day−1 (see main text).
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