EDP Sciences
Gaia Data Release 2
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Fig. B.4

image

Observation statistics at G ≃ 15 for sources with a five-parameter astrometric solution. These statistics are main factors governing the formal uncertainties of the astrometric data. Left: number of visibility periods used. Middle: number of good CCD observations AL. A map of the number of used field-of-view transits is very similar, with a factor nine smaller numbers. Right: mean excess source noise.

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