Missing data effects: Mean shear two-point correlation function (black) with corresponding mean convergence two-point correlation function from SKS (red) and SKS+ (blue) reconstruction method (left panel) and power spectrum (right panel) from SKS (red) and SKS+ (blue) reconstruction method, from incomplete noise-free shear maps, compared to the original convergence map (black). The estimation is only made outside the mask M. The lower panel shows the relative errors introduced by the missing data effects, that is, the normalised difference between the upper curves.