Decomposition of the blended Hα+[N II] for object with a complex shape of the [O III] outflow emission (SDSS J013706.95−090857.4, see Fig. A.1a). The decomposition is done with (a) the sum of the three complex outflow components of the Hα and [N II] doublet, with the same shape as in [O III] lines (see Fig. A.1a1); and (b) with a single broad Gaussian with FWHM ∼ 2600 km s⁻¹. The core components are denoted with a dashed line, and outflow components/broad Gaussian with a solid line.