Density and column density of the warm layer as preferred by the [Fe II] line-emission compared to that preferred by the Balmer break strength. The colored contours show the values of χ_ν² of our fit to the optical [Fe II] of GN-9771 to Cloudy photoionized cloud models with v_turb = 210 km s⁻¹ and Z/Z_⊙ = 0.01. We also show the strength of the Balmer break for the grid of models as cyan contour lines, where we highlight the approximate Balmer break strength (≈2.5) of GN-9771 with a shaded region. The black line marks the contour of the models with matching [Fe II] EW to the observed in GN-9771, in the range 5100–5400 Å. Dashed lines indicate contours of ×2 difference in EW (increasing toward the right-hand side of the figure).