Diagnostic diagrams with data from the 2D study of the X-ray pointing. From the top to the bottom: a) [NII]λλ6584/Hα vs. [SII]λλ6731/Hα, b) [OIII]λλ5007/Hβ vs. [SII]λλ6731/Hα, and c) [OIII]λλ5007/Hβ vs. [NII]λλ6584/Hα. All the spaxels of the intensity maps are represented with crosses. Black lines in the first diagram are the fit performed and the  ± 3σ limits. Colours help us to locate points spatially in Fig. 6: red corresponds to Zone A, blue is Zone B, and green represents Zone C (see text for details).