In the closeup of this diagram below, you can see the estimated angular size of the source star (green circle) as it moves past the second and third caustic crossings (events B and C in the light curv...In the closeup of this diagram below, you can see the estimated angular size of the source star (green circle) as it moves past the second and third caustic crossings (events B and C in the light curve). The limb-darkening parameters are primarily determined by the behavior of the light curve between the time the source edge enters the caustic and the time the source center enters the caustic (and the inverse of this process as the source leaves the caustic).
