Difference in magnitude between VISTA Y and EuclidY_E (top), VISTA J and EuclidJ_E (middle), and VISTA H and EuclidH_E (bottom) and for bright stars with flat colours in VISTA, selected as |Y − J|< 0.05 ∧ |J − H|< 0.05. The red dashed line indicates no colour difference, and the red dotted lines indicate a difference in magnitude of 0.1. A minimum uncertainty of 5% is imposed on the photometry.