Relative difference between the standard deviations of different mock setups for the covariance of the weak lensing band power signals. The relative deviation of the Egretta case (realistic footprint and depth variations) from the Buceros case (rectangular mask, uniform depth) is displayed. Red (blue) symbols show results for the mock (analytic) covariance. Top two rows: GGL signals; bottom three: cosmic shear signals, with bin combinations indicated in the panels. GGL signals that are not used in the analysis have been greyed out. Bands around the mock data points indicate the standard error determined from a jackknife estimate of variance.