The SNR (top) and SNR_diag (bottom) broken down into the clustering (left), weak-lensing E-mode (middle), and B-mode (right) components. The SNR for jackknife shrinkage and DICES are shown. The dashed black line shows the mean and the grey envelopes the 95% confidence interval spread from ten realisations. The box-plot displays the full range with a vertical line, the box representing the interquartile range and the median indicated by a pink horizontal line. Replacing the standard deviations with the debiased jackknife diagonals improves the SNR and SNR_diag for clustering while for E and B-modes they are consistent with and without this correction. For SNR_diag the bias towards low values is seen only for clustering and improves with the corrected covariance but is not completely removed.