Cusp region around a microcaustic with 1 M_⊙ in a macromodel with magnification μ = 23. The gray scale shows the magnification. The region near the caustic with magnification ∼100 is marked in black. The white bar in the bottom right is the distance moved by a background star at z = 0.725 in 1 yr when the relative velocity is 500 km s⁻¹. The maximum magnification is 3700 at the tip of the cusp. The pixel size is 320 R_⊙, so a supergiant star with diameter 80 R_⊙ would reach twice this magnification at the maximum, or ${\mu }_{\max }^{\mathrm{tip}}\approx 7400$. At the fold caustics, the maximum magnification for a 80 R_⊙ diameter star would be smaller, ${\mu }_{\max }^{\mathrm{fold}}\approx 1000$. The straight line with dots shows the track of a hypothetical star moving across the caustic. The size of the dot corresponds to a star with radius 1500 R_⊙.