Expected and observed area in the source plane with magnification μ > 100. The red and blue solid lines show A_far(μ_2m > 100), the expected area in the source plane with magnification greater than 100 around millilenses in the far region for the two different mass functions shown in Figure 6. This area is computed as a function of the number density of millilenses, N_GC, and later rescaled to the area in the far region (960 kpc²). The blue vertical band shows the typical range of number density of GCs at the distance of the Dragon arc from nearby clusters. The horizontal orange band shows A_near(μ_1m > 100), the area in the source plane with macromodel magnification μ_1m > 100. The green horizontal band represents the fraction of microlensing events found in the far region with respect to the near region (∼0.1 to 0.5 times the number of events found in the near region).