Maps of χ² (color-coded) in the S_H – A(O) plane, indicating the quality of the simultaneous fit over all μ-angles of observed and computed 3D non-LTE EW, considering each of the three triplet components separately. The location of the minium χ² is marked by a white plus sign, while the white ellipses bound the regions where (solid) and 2.3 (dashed). The latter corresponds to the simultaneous confidence region of S_H and A(O) containing 68.3% of the data if they were normally distributed. Contour lines indicating where W_obs = W_calc are superimposed for each μ-angle. The top and bottom panels show the results for the WCLC and Pereira spectra, respectively. Line identification and best-fit parameters are given at the top left of each panel.