BPT diagnostics of the extended outflow H0. The grey data points correspond to the 8 × 8 co-added spaxels that belong to the star-forming CNE (see Paper I). The stars represent the two components that are present in the -integrated spectrum that is shown in Fig. 3. The host component (red star) is consistent with SF-classification of the line ratios recovered in the CNE. For the outflowing component (blue star), both [O III] and [N II] emission might be suppressed due to collisional de-excitation in the high density gas. The BPT classification of the outflow as SF-ionised might therefore be misleading.