Distribution of the normalised position residuals Δ between DR1 and RF (solid curves) and between DR1 and FOV (dashed curves) for stars with 1 <σ_G < 5 mas.Left panel: the normalisation is based on σ_Δ computed with A = 1.63; middle panel: the same with A = 1; right panel: the same for stars with σ_G> 7 mas assuming that A = 1. The corresponding Gaussian distributions are shown by dotted lines.