Contribution from microlenses in the far region to high magnification. This result is similar to Figure 7, but considers only the effect of macromodel magnification and microlenses in the far region. The two solid black curves show the area in the far region of the source plane where microlenses create magnification factors > 100 and 200, and as a function of the surface mass density of microlenses. Above μ > 100 in the far region, stars are already very close to a microcaustic and can reach it in a few months. For μ > 200 more stars can be detected, but they reach the microcaustic on a shorter timescale. The vertical blue band shows the expected range of surface mass densities for microlenses that constitute 1% and 2% of the total projected mass. (The convergence at the redshift of the Dragon arc from the macromodel in the Dragon arc region ranges between 0.58 and 0.62, so we adopt the mean value 0.6, while the shear ranges from 0.36 to 0.38.) The vertical dashed line is the fiducial microlensing model.