Top diagram: difference in the value of G (with Δ G = GDR1 − GDR2) as listed for the same sources in Gaia DR1 and Gaia DR2 as a function of (GBP −GRP). The source pairs selected from the two releases match in celestial position to within 0.25 arcsec and the formal error on the magnitude differences is less than 0.01. All sources were selected to have a flux excess factor in Gaia DR2 of less than 1.6. The dashed line shows a polynomial relation between the difference in G and the colour. The colour scale indicates the estimated uncertainty on ΔG. Bottom panel: relation between ΔG and G after removing the colour dependency using the polynomial relation in the top panel.
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