BPT diagrams (top panels) and the dependence of the second-component velocity dispersion σ_2nd on the [N II]/Hα, [O III]/Hβ, and [S II]/Hα line ratios of the Voronoi regions where we do measure a second component related to outflowing gas (bottom panels). The BPT diagrams are colored with its σ_2nd. Dashed lines display the theoretical (Kewley et al. 2001) and empirical (Kauffmann et al. 2003) regions, separating pure star formation and star formation combined with AGN ionization, respectively. Red, black, and green grids display MAPPINGS V shock models for LMC (Z = 0.0071), Dopita_2005 (Z = 0.0065), and solar metallicities (Z = 0.0183), respectively. Grids are for electron density n_e = 1 cm⁻³, with magnetic fields 0.0001 > B < 10 μG and shock velocities 100 <  v_shock <  400 km s⁻¹ (shock velocities usually vary along the x axis of the BPT diagram). Some shock velocity values are indicated, as is the general direction of increasing magnetic field intensity. Blue lines in the bottom panels represent the running median with the 1σ distribution of the Voronoi regions. Dashed green lines represent solar metallicity shock models with B = 1 μG and 0.01 <  n_e <  1000 cm⁻³, identified by the labels. Y-axis values for the dashed green lines are v_shock.