Correlations between B_z(z) and ${\chi }_{\text{v}}^2$. Left panel: difference in the goodness of the fit to Stokes V (circular polarization) by the solenoidal inversion and the MHS inversion normalized to the average of the two. Right panel: percentage of the region (along the z direction) where the observed spectral lines are formed in a manner in which the vertical component of the magnetic field inferred from the solenoidal and MHS inversions agree with the 3σ threshold.