Fig. 5
Parallax S/N ϖL/σ[ϖL] against parallax ϖL for the lens stars in a set of 51 379 source-lens pairs. The continuous line corresponds to σ[ϖL] = 0.4 mas. Rejected lenses fall below this line. The dashed lines representing ϖL/σ[ϖL] = 4 and ϖL = 769 mas correspond to the constraints applied to GDR2 to select the initial lens sample (Table 1).
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