Differences in parallax between the baseline primary solution and a special validation solution with colour terms in the calibration model. a) Blue sources (colour index C ≤ 0.75). b) All TGAS sources. c) Red sources (C> 0.75). Median differences are shown in cells of about 3.36 deg2. The maps use an Aitoff projection in equatorial (ICRS) coordinates, with origin α = δ = 0 at the centre and α increasing from right to left.
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