WL convergence K reconstruction of the A2390 field. The left panel shows the reconstructed E-mode signal, with the cluster detected in the central region with high significance. The right panel shows the B mode, which does not include a cosmological signal to first order, but provides an illustration of the noise level of the reconstruction. The green contours start at K = 0.03 and are in steps of ∆K = 0.03. Both reconstructions assume a zero mean convergence when averaged over the full reconstructed sky area.