[SII]-VO87 (top) and [NII]-BPT (lower) plots created using best-fit line fluxes for each source (see the values in Table 3), as seen in Figure 9. We now include the model grids from MAPPINGS III (Allen et al. 2008). Red-shaded lines display models with a constant magnetic parameter ( in units of μG cm^3/2), while blue-shaded lines represent models with a constant shock velocity. We assume solar metallicity, low density (n ∼ 0.1 cm⁻³), and no shock precursor.