Illustration of our simulation. While the lens (thick grey line) passes the background star 1 (dashed blue line) the observed position of the background star is slightly shifted due to microlensing (solid blue line). The Gaia measurements are indicated as black rectangles, where the precision in the along-scan direction is much better than the precision in the across-scan direction. The red arrows indicate the along-scan separation including microlensing, and the yellow dashed arrows show the along-scan separation without microlensing. The difference between both sources shows the astrometric microlensing signal. Due to the different scaning direction, an observation close to the maximal deflection of the microlensing event does not necessarily have the largest signal. A further background star 2 (green) can improve the result.
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