Same as Figure 11 but for [O III] 4363/[O III] 5007 vs. He II 4686/Hβ line ratios. The shock+precursor model (green grids) successfully reproduces most of the observed line ratios, while the AGN photoionization model fails to account for most of the spaxels in the galaxy. The red arrow shows the median value of the 3σ upper limit in the SW nebula.