Results of the WFA B_LOS inversion when the Stokes I and V parameters in a pixel come from two overlapping structures (cf. Eqs. (10) and (11)). Top: B_LOS normalised by dividing it by the maximum LOS magnetic field of the two structures, in absolute value. It is plotted vs. the difference between the two slabs’ Doppler velocity, Δv_D, for several intensity amplitude ratios, I₀₂/I₀₁. The dashed black lines give the results for which |R| > 0.9. In this plot B_LOS1 = 200 G and B_LOS2 = −40 G. Middle: B_LOS distribution from the Monte Carlo experiment. Bottom: B_LOS distribution divided by the maximum of |B_LOS1|,|B_LOS2|. In the middle and bottom panels, the blue and beige colours respectively correspond to all the samples in the Monte Carlo experiment and only those that pass the filter |R| > 0.9.