Running median of parallaxes (mas) on 10001 points with ± 1σ standard error. No large parallax systematics are linked to the (G_BP − G_RP) colour when we use QSO (top left panel) or a sample of stars in the LMC direction (bottom left panel). However, a significant correlation of the parallaxes with the pseudo-colour is present for QSOs (top right panel), and it is much larger in theLMC direction (bottom right panel).