Performance of the 3D (solid lines) and 2D (dashed lines) jackknife in various configurations, plotted as ratios to analytical (shot-noise) errors estimated for the w_g+  statistic. GAMA configurations are plotted on the top row, with SDSS on the bottom. Colour/redshift sample error ratios are vertically offset by increments of 0.5 (equivalent to a 50% difference in the error on w_g+ ) for clarity, and σ^jack./σ^shot. = 1 is indicated for each sample by a dotted horizontal line. Also shown are the Z2R and SR samples’ 2D (left-in-panel) and 3D (right-in-panel) jackknife estimates of absolute correlation matrices , for covariance C_ij, with i , j ∈ [ 1 , 11 ] for 11 bins in r_p. The angular dimensions (RA × Dec) of jackknife patches, in degrees, are indicated. Clearly visible trends are increasingly noisy covariances from larger/fewer patches, and the tendency of the 3D jackknife to smooth this noise. The jackknife configurations we employ in our likelihood analysis are (3 × 5) deg² and (10 × 10) deg² for GAMA and SDSS, respectively.