BPT plots [O III]/Hβ versus [N II]/Hα (left) and [O III]/Hβ versus [S II]/Hα (right) with overlaid Kewley et al. (2001) and Kauffmann et al. (2003) separation lines (black and gray, respectively) and MAPPINGS III (Allen et al. 2008) radiative shock models for solar abundances and preshock electron density n_e = 10 cm⁻³. Each pixel along the slit is plotted with a filled circle with error bars. Large squares show results from spectra integrated over the larger area (usually the whole part of the region crossed by the slit). Colors correspond to those pixels lying within the borders of objects. For consistency with colors used in Fig. 12, all objects are listed, whereas BPT plots are constructed from only low-resolution spectra which cover the large spectral range – objects VIEM 6, 7, 8c, 8d, 9a, 9c, and 10.