Comparison between observed and theoretical sunspot spectra in selected regions of FeH transitions. Blue dashed line – best-fitted g-factor from Afram et al. (2008), red solid line – calculations with MZL library; both with a purely radial field of B = (2.7,0,0) kG. Red dash-dotted line –  synthetic spectra accounted for the horizontal field component B = (2.5,1,0) kG (hardly seen in the figure, coincides with red solid line), brown dotted line – zero-field spectrum. Labels over lines indicate their central wavelengths, omegas of lower and upper states (in brackets), branch, and the J-number of the lower state (in brackets). Wavelengths are in vacuum.