Angular power spectra (red) for angular clustering (upper triangle) and cosmic shear (lower triangle) in the Euclid Flagship simulation with a DR1-like footprint. For cosmic shear, the B-mode spectrum due to mode mixing is shown in blue. Also shown is the expectation for each spectrum (dashed), as computed from the respective mixing matrices. All spectra are binned into 32 angular bins with logarithmic spacing between l = 10 and l = 5000. The y-axis changes to linear scaling when passing through the origin.