Comparison of different estimates of the error in ΔΣ(R) for individual 516 deg² realisations of the MICE mocks, between all pairs of lens spectroscopic redshift slices (rows) and source tomographic samples (columns). The black solid line shows the ratio between the error determined by a jack-knife analysis of the data and the error derived from the diagonal elements of the analytical covariance matrix, and the red dashed line is the ratio between the standard deviation across 10 realisations and the analytical error. No measurements are possible for the lower left-hand set of panels, owing to the adopted cut in source-lens pairs, z_B >  z_l.