Fig. 9
Selected observation statistics at G ≃ 15 for sources with a five-parameter solution in EDR3. These statistics are main factors governing the formal uncertainties of the astrometric data. Top: number of visibility periods used. Middle: number of good CCD observations AL. (The number of FoV transits used in the solution looks very similar, only with a factor nine smaller numbers.) Bottom: mean of log 10 [max(0.001, astrometric_excess_noise)].
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