Galaxy IC1151 as an example of the non-active class based on the BPT diagram and W_Hα criterion (see Sect. 3). Panels A, B, and C: resolved [NII]−,[SII]− and [OI]−BPT diagnostic diagrams, where the solid curve is the empirical star-formation line of Kauffmann et al. (2003) and pixels below this line are dominated by star formation (SF; blue). The division (dash-dotted line) between the Seyfert (Sy; red) and LINER (LR; green) regions in panels B and C is adopted from Kewley et al. (2006), while the empirical Seyferts/LINER division (dotted line) in panel A comes from Cid Fernandes et al. (2010). Panels D, E, and F: resolved [NII]−,[SII]−,  and [OI]−BPT maps corresponding to the BPT diagram. Panels G: resolved W_Hα radial profile from individual spaxels, where the dashed-dotted and dashed lines correspond to the thresholds of 3 and 6 Å, respectively. The blue dotted vertical lines define the bins of 0.5R_e. The black thick line shows the median value of the W_Hα, where the thin black lines indicate the median absolute deviation. Panel H: resolved W_Hα map, where the colour bar indicates the thresholds of the spaxels: W_Hα ≤ 3 Å (violet), 3 Å < W_Hα ≤ 6 Å (orange) and W_Hα > 6 Å (cyan). The dotted line indicates the region of 0.5R_e, where the continuous lines mark separation of 1, 2, and 3R_e. The median value of the W_Hα for the full maps is given as label in the panel. To classify this galaxy as non-active, the central pixels that are below 0.5R_e should not populate the Seyfert region of the BPT diagrams (at least two from the three BPT diagrams), but their W_Hα values can vary, depending on the quenching stage of the galaxy.