The best-fitting results to Hα and [N II] emission lines using three Gaussian functions (model B, left panel) to fit each narrow emission line and two Gaussian functions (model A, right panel) to fit each narrow emission line. In both panels, the cyan components represent the spectrum after subtracting the host galaxy features; the thick red components represent the best-fitting results for emission lines; the thin red and thin blue Gaussian components from left to right indicate the double-peaked features of narrow [N II]λ 6550Å, Hα, and [N II]λ 6585Å. In the left panel, the green Gaussian components indicate the extended components of [N II]λ 6550Å, Hα, and [N II]λ 6585Å. In each panel, the corresponding χ²/dof related to the best-fitting results is marked in the title.