Corrected flux ratio (C/B)corr in the gVrRI bands. Each sharp monochromatic variation is fitted to the microlensing model μcaustic for a p = 3/2 power-law source (see Appendix B), yielding the solid and dashed lines (best-fit curves) associated with the caustic crossing events in 2012–2013 and 2015–2016, respectively.
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