Example of a light curve in a crowded field. The surface mass density of microlenses is ≈2 M_⊙ pc⁻², a typical value responsible for the intracluster light (ICL) near the tangential critical curves of high redshift sources. The black solid line shows the light curve for a 20 solar radii background star and it is compared with the ray tracing solution (red curve) for a resolution of 30 nas per pixel. As in the previous examples, ray tracing cannot capture the fine details near the microcaustics. The 2D image in the center shows the magnification map in the source plane and the straight line marks the trajectory of the background star across the field of microcaustics.