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microlensing caustics

A microlensing magnification map, whereby individual images are magnified in a multiply-imaged quasar due to an ensemble of stellar-mass compact objects near the line of sight. Such a map is a statistical representation of the combined effects of an ensemble of microlenses, and is rendered as a discrete/pixelized image. As in this case, a network of caustics is commonly visible, representing regions of high magnification in the source plane.