Gaia Data Release 1
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Fig. 22

image

Error correlation levels for Pleiades members as a function of position relative to the cluster centre. For reasons not understood, correlations appear to be stronger towards the cluster centre. The blue points, representing the negative correlation coefficients, all have Tycho-2 first-epoch data. For stars with Hipparcos first epoch data (green points) the correlations are almost zero.

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