Gaia Data Release 1
Free Access

Fig. 1

image

Logarithm of the square root of the normalized χ2 values for the astrometric solutions as a function of the G-band magnitude. The data come from an 18 degrees radius field, centred on the Hyades cluster. The blue dots used first epoch from the Hipparcos catalogue, the red dots from the Tycho-2 catalogue.

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