Relative equivalent width changes of the Fe i lines, [W(B ≠ 0) − W(B = 0)] /W(B = 0), caused by the direct Zeeman broadening effect versus the line’s effective Lande factor g_L. The equivalent widths W(B ≠ 0) and W(B = 0) were calculated using, respectively, the ⟨ | B_z | ⟩ = 80 G snapshot model and the same model assuming B = 0 G at each grid point. See Fig. 4 for further information.