KiDS-Legacy-like covariance matrix for COSEBIs. The diagonals are in the following order i≤j with the tomographic bin indices i and j and in each little sub-block the order of the COSEBIs runs over n=1,…,5. Furthermore, we omit the B-mode signal here, since it is pure shape noise in the case of COSEBIs. The six different panels show the relative contribution of each term to the total covariance. In particular, we show the super-sample covariance (SSC), the non-Gaussian (nG), and the Gaussian (G) contribution in the upper three panels (compare Equations (2), and (3)). The lower three panels show the three components of the Gaussian contribution, the sample variance (sva), the mixed term (mix), and the shape or shot noise term (sn), as described in Equation (6).